<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.oildri.com/role/AccumulatedOtherComprehensiveLossIncomeAccumulatedOtherComprehensiveIncomeDetails" xlink:href="odc-20200731.xsd#AccumulatedOtherComprehensiveLossIncomeAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/AccumulatedOtherComprehensiveLossIncomeAccumulatedOtherComprehensiveIncomeTables" xlink:href="odc-20200731.xsd#AccumulatedOtherComprehensiveLossIncomeAccumulatedOtherComprehensiveIncomeTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/AccumulatedOtherComprehensiveLossIncomeLevel1Notes" xlink:href="odc-20200731.xsd#AccumulatedOtherComprehensiveLossIncomeLevel1Notes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/AccumulatedOtherComprehensiveLossIncomeNarrativeDetails" xlink:href="odc-20200731.xsd#AccumulatedOtherComprehensiveLossIncomeNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/CondensedConsolidatedBalanceSheetParentheticalsParentheticals" xlink:href="odc-20200731.xsd#CondensedConsolidatedBalanceSheetParentheticalsParentheticals" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/ConsolidateStatementsOfComprehensiveIncomeStatement" xlink:href="odc-20200731.xsd#ConsolidateStatementsOfComprehensiveIncomeStatement" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/ConsolidatedBalanceSheets" xlink:href="odc-20200731.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="odc-20200731.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/ConsolidatedStatementsOfOperations" xlink:href="odc-20200731.xsd#ConsolidatedStatementsOfOperations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/ConsolidatedStatementsOfStockholdersEquityStatement" xlink:href="odc-20200731.xsd#ConsolidatedStatementsOfStockholdersEquityStatement" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/CoverPageCoverPage" xlink:href="odc-20200731.xsd#CoverPageCoverPage" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/DebtDebtNarrativeDetails" xlink:href="odc-20200731.xsd#DebtDebtNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/DebtLevel1Notes" xlink:href="odc-20200731.xsd#DebtLevel1Notes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/DebtMaturitiesOfNotesPayableDetails" xlink:href="odc-20200731.xsd#DebtMaturitiesOfNotesPayableDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/DebtNotesPayableDetails" xlink:href="odc-20200731.xsd#DebtNotesPayableDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/DebtTables" xlink:href="odc-20200731.xsd#DebtTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/DeferredCompensationDeferredCompAndBonusDetails" xlink:href="odc-20200731.xsd#DeferredCompensationDeferredCompAndBonusDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/DeferredCompensationLevel1Notes" xlink:href="odc-20200731.xsd#DeferredCompensationLevel1Notes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/DeferredCompensationSerpDetails" xlink:href="odc-20200731.xsd#DeferredCompensationSerpDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/FinancialInstrumentsFairValuePolicies" xlink:href="odc-20200731.xsd#FinancialInstrumentsFairValuePolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/FinancialInstrumentsLevel1Notes" xlink:href="odc-20200731.xsd#FinancialInstrumentsLevel1Notes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/FinancialInstrumentsNarrativeDetails" xlink:href="odc-20200731.xsd#FinancialInstrumentsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/IncomeTaxesComponentsOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:href="odc-20200731.xsd#IncomeTaxesComponentsOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/IncomeTaxesIncomeTaxEffectiveRateReconciliationDetails" xlink:href="odc-20200731.xsd#IncomeTaxesIncomeTaxEffectiveRateReconciliationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/IncomeTaxesIncomeTaxProvisionDetails" xlink:href="odc-20200731.xsd#IncomeTaxesIncomeTaxProvisionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/IncomeTaxesLevel1Notes" xlink:href="odc-20200731.xsd#IncomeTaxesLevel1Notes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/IncomeTaxesNarrativeDetails" xlink:href="odc-20200731.xsd#IncomeTaxesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/IncomeTaxesTables" xlink:href="odc-20200731.xsd#IncomeTaxesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/LeasesLeaseCostDetails" xlink:href="odc-20200731.xsd#LeasesLeaseCostDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/LeasesLesseeOperatingLeaseLiabilityPaymentDueRollingMaturityDetails" xlink:href="odc-20200731.xsd#LeasesLesseeOperatingLeaseLiabilityPaymentDueRollingMaturityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/LeasesLevel1Notes" xlink:href="odc-20200731.xsd#LeasesLevel1Notes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/LeasesNarrativeDetails" xlink:href="odc-20200731.xsd#LeasesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/LeasesOperatingLeasesFutureMinimumPaymentsDueFiscalYearMaturityDetails" xlink:href="odc-20200731.xsd#LeasesOperatingLeasesFutureMinimumPaymentsDueFiscalYearMaturityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/LeasesTables" xlink:href="odc-20200731.xsd#LeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/OperatingSegmentsDetails" xlink:href="odc-20200731.xsd#OperatingSegmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/OperatingSegmentsDisaggregationOfRevenueDetails" xlink:href="odc-20200731.xsd#OperatingSegmentsDisaggregationOfRevenueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/OperatingSegmentsFinancialInformationByGeographicRegionDetails" xlink:href="odc-20200731.xsd#OperatingSegmentsFinancialInformationByGeographicRegionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/OperatingSegmentsLargestCustomerDetails" xlink:href="odc-20200731.xsd#OperatingSegmentsLargestCustomerDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/OperatingSegmentsLevel1Notes" xlink:href="odc-20200731.xsd#OperatingSegmentsLevel1Notes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/OperatingSegmentsLevel2Policy" xlink:href="odc-20200731.xsd#OperatingSegmentsLevel2Policy" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/OperatingSegmentsNarrativeDetails" xlink:href="odc-20200731.xsd#OperatingSegmentsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/OperatingSegmentsTables" xlink:href="odc-20200731.xsd#OperatingSegmentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/OtherContingenciesLevel1Notes" xlink:href="odc-20200731.xsd#OtherContingenciesLevel1Notes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsAmountsRecognizedInConsolidatedBalanceSheetDetails" xlink:href="odc-20200731.xsd#PensionAndOtherPostretirementBenefitsAmountsRecognizedInConsolidatedBalanceSheetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsAmountsRecognizedInOtherComprehensiveIncomeDetails" xlink:href="odc-20200731.xsd#PensionAndOtherPostretirementBenefitsAmountsRecognizedInOtherComprehensiveIncomeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsAmountsToBeRecognizedInOtherComprehensiveIncomeInNextFiscalYearDetails" xlink:href="odc-20200731.xsd#PensionAndOtherPostretirementBenefitsAmountsToBeRecognizedInOtherComprehensiveIncomeInNextFiscalYearDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsAssumptionsUsedInCalculationsDetails" xlink:href="odc-20200731.xsd#PensionAndOtherPostretirementBenefitsAssumptionsUsedInCalculationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsChangeInBenefitObligationAndPlanAssetsFundedStatusDetails" xlink:href="odc-20200731.xsd#PensionAndOtherPostretirementBenefitsChangeInBenefitObligationAndPlanAssetsFundedStatusDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsComponentsOfNetPeriodicBenefitCostDetails" xlink:href="odc-20200731.xsd#PensionAndOtherPostretirementBenefitsComponentsOfNetPeriodicBenefitCostDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsEffectOfOnePercentagePointChangeInAssumedHealthcareTrendDetails" xlink:href="odc-20200731.xsd#PensionAndOtherPostretirementBenefitsEffectOfOnePercentagePointChangeInAssumedHealthcareTrendDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsEstimatedFutureBenefitPaymentsDetails" xlink:href="odc-20200731.xsd#PensionAndOtherPostretirementBenefitsEstimatedFutureBenefitPaymentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsFairValueLevelOfPensionPlanAssetsDetails" xlink:href="odc-20200731.xsd#PensionAndOtherPostretirementBenefitsFairValueLevelOfPensionPlanAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsLevel1Notes" xlink:href="odc-20200731.xsd#PensionAndOtherPostretirementBenefitsLevel1Notes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsNarrativeDetails" xlink:href="odc-20200731.xsd#PensionAndOtherPostretirementBenefitsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsPlanAssetsAllocationPercentagesDetails" xlink:href="odc-20200731.xsd#PensionAndOtherPostretirementBenefitsPlanAssetsAllocationPercentagesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsTables" xlink:href="odc-20200731.xsd#PensionAndOtherPostretirementBenefitsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/RelatedPartyTransactionsDetails" xlink:href="odc-20200731.xsd#RelatedPartyTransactionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/RelatedPartyTransactionsNotes" xlink:href="odc-20200731.xsd#RelatedPartyTransactionsNotes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/StockBasedCompensationNarrativeDetails" xlink:href="odc-20200731.xsd#StockBasedCompensationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/StockBasedCompensationNotes" xlink:href="odc-20200731.xsd#StockBasedCompensationNotes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/StockBasedCompensationStockBasedCompensationPolicies" xlink:href="odc-20200731.xsd#StockBasedCompensationStockBasedCompensationPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/StockBasedCompensationSummaryOfOptionActivityDetails" xlink:href="odc-20200731.xsd#StockBasedCompensationSummaryOfOptionActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/StockBasedCompensationSummaryOfRestrictedStockActivityDetails" xlink:href="odc-20200731.xsd#StockBasedCompensationSummaryOfRestrictedStockActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/StockBasedCompensationTables" xlink:href="odc-20200731.xsd#StockBasedCompensationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/SubsequentEventsDetails" xlink:href="odc-20200731.xsd#SubsequentEventsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/SubsequentEventsLevel1Notes" xlink:href="odc-20200731.xsd#SubsequentEventsLevel1Notes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/SubsequentEventsTables" xlink:href="odc-20200731.xsd#SubsequentEventsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsAmortizationExpenseDetails" xlink:href="odc-20200731.xsd#SummaryOfSignificantAccountingPoliciesIntangibleAssetsAmortizationExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsWeightedAverageAmortizationPeriodDetails" xlink:href="odc-20200731.xsd#SummaryOfSignificantAccountingPoliciesIntangibleAssetsWeightedAverageAmortizationPeriodDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesInventoriesDetails" xlink:href="odc-20200731.xsd#SummaryOfSignificantAccountingPoliciesInventoriesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesLevel1Notes" xlink:href="odc-20200731.xsd#SummaryOfSignificantAccountingPoliciesLevel1Notes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesLevel2Policies" xlink:href="odc-20200731.xsd#SummaryOfSignificantAccountingPoliciesLevel2Policies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesLevel3Tables" xlink:href="odc-20200731.xsd#SummaryOfSignificantAccountingPoliciesLevel3Tables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails" xlink:href="odc-20200731.xsd#SummaryOfSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesPropertyPlantAndEquipmentDetails" xlink:href="odc-20200731.xsd#SummaryOfSignificantAccountingPoliciesPropertyPlantAndEquipmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:href="odc-20200731.xsd#SummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/AccumulatedOtherComprehensiveLossIncomeAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1CA425DE15FA407361FAFBA0FBE1C5BB" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_DEE7B337C81BF8E5D9B6FBA0FBE02F9D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1CA425DE15FA407361FAFBA0FBE1C5BB" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_DEE7B337C81BF8E5D9B6FBA0FBE02F9D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_65DDB42CB0D0E1CC850EFBA0FBE0E027" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_DEE7B337C81BF8E5D9B6FBA0FBE02F9D" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_65DDB42CB0D0E1CC850EFBA0FBE0E027" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_06F1344FC3ECAA4C9C04FBA0FBE0D340_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_65DDB42CB0D0E1CC850EFBA0FBE0E027" xlink:to="loc_us-gaap_EquityComponentDomain_06F1344FC3ECAA4C9C04FBA0FBE0D340_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_06F1344FC3ECAA4C9C04FBA0FBE0D340" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_65DDB42CB0D0E1CC850EFBA0FBE0E027" xlink:to="loc_us-gaap_EquityComponentDomain_06F1344FC3ECAA4C9C04FBA0FBE0D340" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_0D2F0C78728BCA8A4F4AFBA0FBE0AE57" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_06F1344FC3ECAA4C9C04FBA0FBE0D340" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_0D2F0C78728BCA8A4F4AFBA0FBE0AE57" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember" xlink:label="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_345B37170A663DD1A989FBA0FBE16797" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_06F1344FC3ECAA4C9C04FBA0FBE0D340" xlink:to="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_345B37170A663DD1A989FBA0FBE16797" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember" xlink:label="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_6A9A4FF1CD7C3B7E1471FBA0FBE136D2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_06F1344FC3ECAA4C9C04FBA0FBE0D340" xlink:to="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_6A9A4FF1CD7C3B7E1471FBA0FBE136D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_DFAF19955AC282B687BCFBA0FBE1734B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1CA425DE15FA407361FAFBA0FBE1C5BB" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_DFAF19955AC282B687BCFBA0FBE1734B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_CDE39BC785FF534F729BFBA0FBE1437E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1CA425DE15FA407361FAFBA0FBE1C5BB" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_CDE39BC785FF534F729BFBA0FBE1437E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_A7AC4249552236657E51FBA0FBE2FDD5" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1CA425DE15FA407361FAFBA0FBE1C5BB" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_A7AC4249552236657E51FBA0FBE2FDD5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax_8884255073D2A5635D64FBA0FBE298D6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1CA425DE15FA407361FAFBA0FBE1C5BB" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax_8884255073D2A5635D64FBA0FBE298D6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_73C00D04E9FE8D371EC1FBA0FBE271AD" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1CA425DE15FA407361FAFBA0FBE1C5BB" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_73C00D04E9FE8D371EC1FBA0FBE271AD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax_B8277F770D053C949797FBA0FBE29AB4" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1CA425DE15FA407361FAFBA0FBE1C5BB" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax_B8277F770D053C949797FBA0FBE29AB4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax_B4410C917C5419D419DBFBA0FBE2DE53" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1CA425DE15FA407361FAFBA0FBE1C5BB" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax_B4410C917C5419D419DBFBA0FBE2DE53" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax_AA677C6E4B1825A27286FBA0FBE321F2" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1CA425DE15FA407361FAFBA0FBE1C5BB" xlink:to="loc_us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax_AA677C6E4B1825A27286FBA0FBE321F2" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/AccumulatedOtherComprehensiveLossIncomeAccumulatedOtherComprehensiveIncomeTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/AccumulatedOtherComprehensiveLossIncomeLevel1Notes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/AccumulatedOtherComprehensiveLossIncomeNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockLineItems" xlink:label="loc_us-gaap_ClassOfStockLineItems_AC13BDEAB5D318E581E84FC58EBBCF27" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfStockByClassTable" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_8B1A9A3A01A3631F75C64FC58EBA519E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_AC13BDEAB5D318E581E84FC58EBBCF27" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_8B1A9A3A01A3631F75C64FC58EBA519E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_E5CC6708811DD6098BA24FC58EBAF4DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_8B1A9A3A01A3631F75C64FC58EBA519E" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_E5CC6708811DD6098BA24FC58EBAF4DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_ACE17DCCC1B29B64B2B24FC58EBADAC2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_E5CC6708811DD6098BA24FC58EBAF4DF" xlink:to="loc_us-gaap_EquityComponentDomain_ACE17DCCC1B29B64B2B24FC58EBADAC2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_ACE17DCCC1B29B64B2B24FC58EBADAC2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_E5CC6708811DD6098BA24FC58EBAF4DF" xlink:to="loc_us-gaap_EquityComponentDomain_ACE17DCCC1B29B64B2B24FC58EBADAC2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_79321A9A5FB32FF5B3404FC58EBB7222" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ACE17DCCC1B29B64B2B24FC58EBADAC2" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_79321A9A5FB32FF5B3404FC58EBB7222" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_4BA2F678105DBDBCEA5B4FC58EBB5EB0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_8B1A9A3A01A3631F75C64FC58EBA519E" xlink:to="loc_us-gaap_StatementClassOfStockAxis_4BA2F678105DBDBCEA5B4FC58EBB5EB0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_57912481E9943567F1B84FC58EBB71C2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_4BA2F678105DBDBCEA5B4FC58EBB5EB0" xlink:to="loc_us-gaap_ClassOfStockDomain_57912481E9943567F1B84FC58EBB71C2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_57912481E9943567F1B84FC58EBB71C2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_4BA2F678105DBDBCEA5B4FC58EBB5EB0" xlink:to="loc_us-gaap_ClassOfStockDomain_57912481E9943567F1B84FC58EBB71C2" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/CondensedConsolidatedBalanceSheetParentheticalsParentheticals" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_EA954B285A1EF791928A4FC58F43B419" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_ECBF04FB6280C32931B94FC58F429DF4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_EA954B285A1EF791928A4FC58F43B419" xlink:to="loc_us-gaap_StatementTable_ECBF04FB6280C32931B94FC58F429DF4" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_B6A132BE7C5C7A6F5DD74FC58F42FAA0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_ECBF04FB6280C32931B94FC58F429DF4" xlink:to="loc_us-gaap_StatementClassOfStockAxis_B6A132BE7C5C7A6F5DD74FC58F42FAA0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_3C8C16FC469E78FECF364FC58F433E13_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_B6A132BE7C5C7A6F5DD74FC58F42FAA0" xlink:to="loc_us-gaap_ClassOfStockDomain_3C8C16FC469E78FECF364FC58F433E13_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_3C8C16FC469E78FECF364FC58F433E13" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_B6A132BE7C5C7A6F5DD74FC58F42FAA0" xlink:to="loc_us-gaap_ClassOfStockDomain_3C8C16FC469E78FECF364FC58F433E13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_E7ACDE666F438EB5720D4FC58F430A39" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_3C8C16FC469E78FECF364FC58F433E13" xlink:to="loc_us-gaap_CommonStockMember_E7ACDE666F438EB5720D4FC58F430A39" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_9C86DE91AB36FE96E4FA4FC58F43B50C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_3C8C16FC469E78FECF364FC58F433E13" xlink:to="loc_us-gaap_CommonClassBMember_9C86DE91AB36FE96E4FA4FC58F43B50C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_9EC663BF5058BA8845AA4FC58F4365BD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EA954B285A1EF791928A4FC58F43B419" xlink:to="loc_us-gaap_AssetsCurrentAbstract_9EC663BF5058BA8845AA4FC58F4365BD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_D2A6127613E7B8EC42FB4FC58F4432E0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_9EC663BF5058BA8845AA4FC58F4365BD" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_D2A6127613E7B8EC42FB4FC58F4432E0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrentAbstract" xlink:label="loc_us-gaap_OtherAssetsNoncurrentAbstract_82353B8E356D648B82214FC58F443820" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EA954B285A1EF791928A4FC58F43B419" xlink:to="loc_us-gaap_OtherAssetsNoncurrentAbstract_82353B8E356D648B82214FC58F443820" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_TrademarksandpatentsaccumulatedAmortization" xlink:label="loc_odc_TrademarksandpatentsaccumulatedAmortization_CEB95BC5876A5992CF684FC58F446ED7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_82353B8E356D648B82214FC58F443820" xlink:to="loc_odc_TrademarksandpatentsaccumulatedAmortization_CEB95BC5876A5992CF684FC58F446ED7" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_Customerlistaccumulatedamortization" xlink:label="loc_odc_Customerlistaccumulatedamortization_940EF320DD1DAB3804C24FC58F4593B6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_82353B8E356D648B82214FC58F443820" xlink:to="loc_odc_Customerlistaccumulatedamortization_940EF320DD1DAB3804C24FC58F4593B6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesNoncurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract_52AF1BA33CC946DAE4B54FC58F45D490" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EA954B285A1EF791928A4FC58F43B419" xlink:to="loc_us-gaap_LiabilitiesNoncurrentAbstract_52AF1BA33CC946DAE4B54FC58F45D490" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredFinanceCostsNoncurrentNet" xlink:label="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_E1EABE7C43A317B6097E4FC58F45BFB9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_52AF1BA33CC946DAE4B54FC58F45D490" xlink:to="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_E1EABE7C43A317B6097E4FC58F45BFB9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_3BD97B79F93C7B9A31184FC58F45DCF1" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EA954B285A1EF791928A4FC58F43B419" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_3BD97B79F93C7B9A31184FC58F45DCF1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_68233FFDB362671329C24FC58F457406" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_3BD97B79F93C7B9A31184FC58F45DCF1" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_68233FFDB362671329C24FC58F457406" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_BD17D124D98FF646069A4FC58F463B52" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_3BD97B79F93C7B9A31184FC58F45DCF1" xlink:to="loc_us-gaap_CommonStockSharesIssued_BD17D124D98FF646069A4FC58F463B52" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="loc_us-gaap_TreasuryStockShares_36B746C148CDBFAD4C994FC58F4633BA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_3BD97B79F93C7B9A31184FC58F45DCF1" xlink:to="loc_us-gaap_TreasuryStockShares_36B746C148CDBFAD4C994FC58F4633BA" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/ConsolidateStatementsOfComprehensiveIncomeStatement" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_05AEFC4943935416A128FB9AF402744A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_8BDCCFA50267DCF3D4E2FB9AF4029392" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_05AEFC4943935416A128FB9AF402744A" xlink:to="loc_us-gaap_StatementTable_8BDCCFA50267DCF3D4E2FB9AF4029392" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementScenarioAxis" xlink:label="loc_srt_StatementScenarioAxis_981EEB4A2DEC62A6BAC5FB9AF40259C3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8BDCCFA50267DCF3D4E2FB9AF4029392" xlink:to="loc_srt_StatementScenarioAxis_981EEB4A2DEC62A6BAC5FB9AF40259C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_35E8A28BD6B925746D28FB9AF4029422_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_981EEB4A2DEC62A6BAC5FB9AF40259C3" xlink:to="loc_srt_ScenarioUnspecifiedDomain_35E8A28BD6B925746D28FB9AF4029422_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_35E8A28BD6B925746D28FB9AF4029422" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_981EEB4A2DEC62A6BAC5FB9AF40259C3" xlink:to="loc_srt_ScenarioUnspecifiedDomain_35E8A28BD6B925746D28FB9AF4029422" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAbstract" xlink:label="loc_us-gaap_NetIncomeLossAbstract_D2318934D984D9EC911CFB9AF4037C28" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_05AEFC4943935416A128FB9AF402744A" xlink:to="loc_us-gaap_NetIncomeLossAbstract_D2318934D984D9EC911CFB9AF4037C28" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_F0427A537266A63000B5FB9AF403B434" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAbstract_D2318934D984D9EC911CFB9AF4037C28" xlink:to="loc_us-gaap_NetIncomeLoss_F0427A537266A63000B5FB9AF403B434" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_71B57DD3E90415830697FB9AF4035F21" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_05AEFC4943935416A128FB9AF402744A" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_71B57DD3E90415830697FB9AF4035F21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_FF4D15D685E73553265FFB9AF40325EB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_71B57DD3E90415830697FB9AF4035F21" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_FF4D15D685E73553265FFB9AF40325EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_962195E23BD04315AB91FB9AF4038D2E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_71B57DD3E90415830697FB9AF4035F21" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_962195E23BD04315AB91FB9AF4038D2E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_795F0D7AD09060DC29D9FB9AF404BE48" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_71B57DD3E90415830697FB9AF4035F21" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_795F0D7AD09060DC29D9FB9AF404BE48" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_5DAF95CA1057DF3E6188FB9AF4040C5F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_05AEFC4943935416A128FB9AF402744A" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_5DAF95CA1057DF3E6188FB9AF4040C5F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_9CF13E16AE855D50B5D70F8CFCC3579B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_2E6A1620F995332B23240F8CFCC1BB80" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_9CF13E16AE855D50B5D70F8CFCC3579B" xlink:to="loc_us-gaap_StatementTable_2E6A1620F995332B23240F8CFCC1BB80" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_AC2CBA07931EBD273E2D0F8CFCC15B60" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_2E6A1620F995332B23240F8CFCC1BB80" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_AC2CBA07931EBD273E2D0F8CFCC15B60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_FA56188067369222AAE80F8CFCC1A58D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_AC2CBA07931EBD273E2D0F8CFCC15B60" xlink:to="loc_us-gaap_EquityComponentDomain_FA56188067369222AAE80F8CFCC1A58D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_FA56188067369222AAE80F8CFCC1A58D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_AC2CBA07931EBD273E2D0F8CFCC15B60" xlink:to="loc_us-gaap_EquityComponentDomain_FA56188067369222AAE80F8CFCC1A58D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_602ABC1A09A85D5E4AE90F8CFCC20808" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_2E6A1620F995332B23240F8CFCC1BB80" xlink:to="loc_us-gaap_StatementClassOfStockAxis_602ABC1A09A85D5E4AE90F8CFCC20808" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_5A2F1CA6099620E1A3BC0F8CFCC2E7F6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_602ABC1A09A85D5E4AE90F8CFCC20808" xlink:to="loc_us-gaap_ClassOfStockDomain_5A2F1CA6099620E1A3BC0F8CFCC2E7F6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_5A2F1CA6099620E1A3BC0F8CFCC2E7F6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_602ABC1A09A85D5E4AE90F8CFCC20808" xlink:to="loc_us-gaap_ClassOfStockDomain_5A2F1CA6099620E1A3BC0F8CFCC2E7F6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_8990C9B9C9A5D231D95C0F8CFCC23EF9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_5A2F1CA6099620E1A3BC0F8CFCC2E7F6" xlink:to="loc_us-gaap_CommonStockMember_8990C9B9C9A5D231D95C0F8CFCC23EF9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_C15689105693374272660F8CFCC31FDC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_5A2F1CA6099620E1A3BC0F8CFCC2E7F6" xlink:to="loc_us-gaap_CommonClassBMember_C15689105693374272660F8CFCC31FDC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_13976B607567F688E82C0F8CFCC36B1E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9CF13E16AE855D50B5D70F8CFCC3579B" xlink:to="loc_us-gaap_AssetsAbstract_13976B607567F688E82C0F8CFCC36B1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_2A30940C4E3AA7B95F8F0F8CFCC33C8F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_13976B607567F688E82C0F8CFCC36B1E" xlink:to="loc_us-gaap_AssetsCurrentAbstract_2A30940C4E3AA7B95F8F0F8CFCC33C8F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_344E85B4BF34A4C6064D0F8CFCC41DE5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_2A30940C4E3AA7B95F8F0F8CFCC33C8F" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_344E85B4BF34A4C6064D0F8CFCC41DE5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_2AAF8580AF8BD50F62450F8CFCC4339F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_2A30940C4E3AA7B95F8F0F8CFCC33C8F" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_2AAF8580AF8BD50F62450F8CFCC4339F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_9FAB0F1E9AEBA8FDFA870F8CFCC4CAF4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_2A30940C4E3AA7B95F8F0F8CFCC33C8F" xlink:to="loc_us-gaap_InventoryNet_9FAB0F1E9AEBA8FDFA870F8CFCC4CAF4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredCostsCurrent" xlink:label="loc_us-gaap_DeferredCostsCurrent_711DFA2323251E7C9A7D0F8CFCC4550A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_2A30940C4E3AA7B95F8F0F8CFCC33C8F" xlink:to="loc_us-gaap_DeferredCostsCurrent_711DFA2323251E7C9A7D0F8CFCC4550A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_F2DE34C9C35547A5E1C50F8CFCC503E0" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_2A30940C4E3AA7B95F8F0F8CFCC33C8F" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_F2DE34C9C35547A5E1C50F8CFCC503E0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_1D64ED53B2C2A5B9751B0F8CFCC50E77" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_2A30940C4E3AA7B95F8F0F8CFCC33C8F" xlink:to="loc_us-gaap_AssetsCurrent_1D64ED53B2C2A5B9751B0F8CFCC50E77" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGrossAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_4531515090A4F5FC7E8A0F8CFCC55AD6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_13976B607567F688E82C0F8CFCC36B1E" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_4531515090A4F5FC7E8A0F8CFCC55AD6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BuildingsAndImprovementsGross" xlink:label="loc_us-gaap_BuildingsAndImprovementsGross_3C0F4A0CD71167FB59F20F8CFCC518C5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_4531515090A4F5FC7E8A0F8CFCC55AD6" xlink:to="loc_us-gaap_BuildingsAndImprovementsGross_3C0F4A0CD71167FB59F20F8CFCC518C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MachineryAndEquipmentGross" xlink:label="loc_us-gaap_MachineryAndEquipmentGross_5DDC2ADB0135D3B53A460F8CFCC5C85B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_4531515090A4F5FC7E8A0F8CFCC55AD6" xlink:to="loc_us-gaap_MachineryAndEquipmentGross_5DDC2ADB0135D3B53A460F8CFCC5C85B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOther" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOther_A4485E4AF35527D4116A0F8CFCC62B73" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_4531515090A4F5FC7E8A0F8CFCC55AD6" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentOther_A4485E4AF35527D4116A0F8CFCC62B73" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_Vehicles" xlink:label="loc_odc_Vehicles_4AD551C9BD65696F535D0F8CFCC6F87E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_4531515090A4F5FC7E8A0F8CFCC55AD6" xlink:to="loc_odc_Vehicles_4AD551C9BD65696F535D0F8CFCC6F87E" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_Grossdepreciableassets" xlink:label="loc_odc_Grossdepreciableassets_90A61F76639892BFE15D0F8CFCC652F5" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_4531515090A4F5FC7E8A0F8CFCC55AD6" xlink:to="loc_odc_Grossdepreciableassets_90A61F76639892BFE15D0F8CFCC652F5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_9C46FB65D5599D72B9920F8CFCC63B14" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_4531515090A4F5FC7E8A0F8CFCC55AD6" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_9C46FB65D5599D72B9920F8CFCC63B14" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_Netdepreciableassets" xlink:label="loc_odc_Netdepreciableassets_E1F5900CBB925DE5C0170F8CFCC66B38" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_4531515090A4F5FC7E8A0F8CFCC55AD6" xlink:to="loc_odc_Netdepreciableassets_E1F5900CBB925DE5C0170F8CFCC66B38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConstructionInProgressGross" xlink:label="loc_us-gaap_ConstructionInProgressGross_9A8572EA027E678C68750F8CFCC77C19" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_4531515090A4F5FC7E8A0F8CFCC55AD6" xlink:to="loc_us-gaap_ConstructionInProgressGross_9A8572EA027E678C68750F8CFCC77C19" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_Landmineralrightsandreclamationasset" xlink:label="loc_odc_Landmineralrightsandreclamationasset_BFCD251A48AF8831086F0F8CFCC7E902" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_4531515090A4F5FC7E8A0F8CFCC55AD6" xlink:to="loc_odc_Landmineralrightsandreclamationasset_BFCD251A48AF8831086F0F8CFCC7E902" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_948CAB12D7B645340F080F8CFCC73566" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_4531515090A4F5FC7E8A0F8CFCC55AD6" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_948CAB12D7B645340F080F8CFCC73566" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrentAbstract" xlink:label="loc_us-gaap_OtherAssetsNoncurrentAbstract_E9F1F661552DCCFF3F9D0F8CFCC7121C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_13976B607567F688E82C0F8CFCC36B1E" xlink:to="loc_us-gaap_OtherAssetsNoncurrentAbstract_E9F1F661552DCCFF3F9D0F8CFCC7121C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_35E2DF6505B1F26BA7F40F8CFCC7E73C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_E9F1F661552DCCFF3F9D0F8CFCC7121C" xlink:to="loc_us-gaap_Goodwill_35E2DF6505B1F26BA7F40F8CFCC7E73C" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_Trademarksandpatents" xlink:label="loc_odc_Trademarksandpatents_CD665BCE3A9311DF98520F8CFCC8D872" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_E9F1F661552DCCFF3F9D0F8CFCC7121C" xlink:to="loc_odc_Trademarksandpatents_CD665BCE3A9311DF98520F8CFCC8D872" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_Customerlistnet" xlink:label="loc_odc_Customerlistnet_CE9911C7181ACC4FACFE0F8CFCC888DC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_E9F1F661552DCCFF3F9D0F8CFCC7121C" xlink:to="loc_odc_Customerlistnet_CE9911C7181ACC4FACFE0F8CFCC888DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_F6C641BAFC7FF88AAD250F8CFCC811C4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_E9F1F661552DCCFF3F9D0F8CFCC7121C" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_F6C641BAFC7FF88AAD250F8CFCC811C4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_4FEF394B95E2F3EAC6890F8CFCC8AC53" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_E9F1F661552DCCFF3F9D0F8CFCC7121C" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_4FEF394B95E2F3EAC6890F8CFCC8AC53" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_971FB39D22F20D3C44BC0F8CFCC8E43B" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_E9F1F661552DCCFF3F9D0F8CFCC7121C" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_971FB39D22F20D3C44BC0F8CFCC8E43B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsNoncurrent" xlink:label="loc_us-gaap_AssetsNoncurrent_CC42A11A58906A5AA01C0F8CFCC908B4" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_E9F1F661552DCCFF3F9D0F8CFCC7121C" xlink:to="loc_us-gaap_AssetsNoncurrent_CC42A11A58906A5AA01C0F8CFCC908B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_325EFF50AA8AC2F7CE640F8CFCC9FF57" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_13976B607567F688E82C0F8CFCC36B1E" xlink:to="loc_us-gaap_Assets_325EFF50AA8AC2F7CE640F8CFCC9FF57" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9901EFCB8F2AF9E720770F8CFCC962FA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9CF13E16AE855D50B5D70F8CFCC3579B" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9901EFCB8F2AF9E720770F8CFCC962FA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_3A81C0675B79A36C628D0F8CFCC9613D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9901EFCB8F2AF9E720770F8CFCC962FA" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_3A81C0675B79A36C628D0F8CFCC9613D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorNotesCurrent" xlink:label="loc_us-gaap_SeniorNotesCurrent_26A3B695B3665ECCF3D70F8CFCCA09FE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_3A81C0675B79A36C628D0F8CFCC9613D" xlink:to="loc_us-gaap_SeniorNotesCurrent_26A3B695B3665ECCF3D70F8CFCCA09FE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_0DD35AC19F1B3A11C0380F8CFCCAA260" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_3A81C0675B79A36C628D0F8CFCC9613D" xlink:to="loc_us-gaap_AccountsPayableCurrent_0DD35AC19F1B3A11C0380F8CFCCAA260" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DividendsPayableCurrent" xlink:label="loc_us-gaap_DividendsPayableCurrent_54EC9E64F4F5593A38D20F8CFCCA982C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_3A81C0675B79A36C628D0F8CFCC9613D" xlink:to="loc_us-gaap_DividendsPayableCurrent_54EC9E64F4F5593A38D20F8CFCCA982C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_2E4F386564A57A7D596F0F8CFCCAD22C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_3A81C0675B79A36C628D0F8CFCC9613D" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_2E4F386564A57A7D596F0F8CFCCAD22C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedLiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_C6BFC2D7FFD57DCCF3FF0F8CFCCA1CC6" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_3A81C0675B79A36C628D0F8CFCC9613D" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_C6BFC2D7FFD57DCCF3FF0F8CFCCA1CC6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_A36979D1FBCD1F7F7A360F8CFCCAD5EE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_C6BFC2D7FFD57DCCF3FF0F8CFCCA1CC6" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_A36979D1FBCD1F7F7A360F8CFCCAD5EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedMarketingCostsCurrent" xlink:label="loc_us-gaap_AccruedMarketingCostsCurrent_329C2CACF20B8AACE44B0F8CFCCB23FD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_C6BFC2D7FFD57DCCF3FF0F8CFCCA1CC6" xlink:to="loc_us-gaap_AccruedMarketingCostsCurrent_329C2CACF20B8AACE44B0F8CFCCB23FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_C6E17494B6952E9897440F8CFCCB7238" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_C6BFC2D7FFD57DCCF3FF0F8CFCCA1CC6" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_C6E17494B6952E9897440F8CFCCB7238" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_AccruedRealEstateTaxCurrent" xlink:label="loc_odc_AccruedRealEstateTaxCurrent_6D9024713EBCC1F9A5E30F8CFCCB11F8" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_C6BFC2D7FFD57DCCF3FF0F8CFCCA1CC6" xlink:to="loc_odc_AccruedRealEstateTaxCurrent_6D9024713EBCC1F9A5E30F8CFCCB11F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_6166BDE4A6F2229E9F460F8CFCCB55C2" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_C6BFC2D7FFD57DCCF3FF0F8CFCCA1CC6" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_6166BDE4A6F2229E9F460F8CFCCB55C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_8ADDDA070D52D9DCFB450F8CFCCB7E95" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_3A81C0675B79A36C628D0F8CFCC9613D" xlink:to="loc_us-gaap_LiabilitiesCurrent_8ADDDA070D52D9DCFB450F8CFCCB7E95" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesNoncurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract_D3700DC45D2A758E1A6E0F8CFCCB9E96" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9901EFCB8F2AF9E720770F8CFCC962FA" xlink:to="loc_us-gaap_LiabilitiesNoncurrentAbstract_D3700DC45D2A758E1A6E0F8CFCCB9E96" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorLongTermNotes" xlink:label="loc_us-gaap_SeniorLongTermNotes_F568F390F83E87C577620F8CFCCC862C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_D3700DC45D2A758E1A6E0F8CFCCB9E96" xlink:to="loc_us-gaap_SeniorLongTermNotes_F568F390F83E87C577620F8CFCCC862C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent" xlink:label="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_55162B1EF8E5330E60CB0F8CFCCCEE30" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_D3700DC45D2A758E1A6E0F8CFCCB9E96" xlink:to="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_55162B1EF8E5330E60CB0F8CFCCCEE30" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_343EEC2C60CDEB400D180F8CFCCCCDF9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_D3700DC45D2A758E1A6E0F8CFCCB9E96" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_343EEC2C60CDEB400D180F8CFCCCCDF9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_1126A2C024D1B07630E90F8CFCCC6BD0" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_D3700DC45D2A758E1A6E0F8CFCCB9E96" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_1126A2C024D1B07630E90F8CFCCC6BD0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_AC2163B8673C0D70698A0F8CFCCC7CDF" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_D3700DC45D2A758E1A6E0F8CFCCB9E96" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_AC2163B8673C0D70698A0F8CFCCC7CDF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesNoncurrent" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_7ED3BE6D064B842254480F8CFCCDDFBD" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_D3700DC45D2A758E1A6E0F8CFCCB9E96" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_7ED3BE6D064B842254480F8CFCCDDFBD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_7A36C58217367C06DE700F8CFCCDBE18" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9901EFCB8F2AF9E720770F8CFCC962FA" xlink:to="loc_us-gaap_Liabilities_7A36C58217367C06DE700F8CFCCDBE18" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_0DC537EF0205249F7D550F8CFCCD314B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9901EFCB8F2AF9E720770F8CFCC962FA" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_0DC537EF0205249F7D550F8CFCCD314B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_7727D8FA42340BF621D40F8CFCCDA0E6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_0DC537EF0205249F7D550F8CFCCD314B" xlink:to="loc_us-gaap_CommonStockValue_7727D8FA42340BF621D40F8CFCCDA0E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_D898776995107AEC8B670F8CFCCD089E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_0DC537EF0205249F7D550F8CFCCD314B" xlink:to="loc_us-gaap_AdditionalPaidInCapital_D898776995107AEC8B670F8CFCCD089E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_2FF74616C1764B19CD7A0F8CFCCDEFB8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_0DC537EF0205249F7D550F8CFCCD314B" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_2FF74616C1764B19CD7A0F8CFCCDEFB8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaap_MinorityInterest_56EEA4174E62F19F4E620F8CFCCE65EB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_0DC537EF0205249F7D550F8CFCCD314B" xlink:to="loc_us-gaap_MinorityInterest_56EEA4174E62F19F4E620F8CFCCE65EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_74DC3BDB85C3FED2C4910F8CFCCE9EEC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_0DC537EF0205249F7D550F8CFCCD314B" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_74DC3BDB85C3FED2C4910F8CFCCE9EEC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax_0D9AF27A717E856298410F8CFCCE2C9A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_74DC3BDB85C3FED2C4910F8CFCCE9EEC" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax_0D9AF27A717E856298410F8CFCCE2C9A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_9B058A77E52EAFC7D0E30F8CFCCE0B79" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_74DC3BDB85C3FED2C4910F8CFCCE9EEC" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_9B058A77E52EAFC7D0E30F8CFCCE0B79" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_8708ADF09B7D1E4012930F8CFCCE7F07" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_74DC3BDB85C3FED2C4910F8CFCCE9EEC" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_8708ADF09B7D1E4012930F8CFCCE7F07" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="loc_us-gaap_TreasuryStockValue_A75910DC485DB15BCFD80F8CFCCF9A4B" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_0DC537EF0205249F7D550F8CFCCD314B" xlink:to="loc_us-gaap_TreasuryStockValue_A75910DC485DB15BCFD80F8CFCCF9A4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_115AF2AF07C34E69D3FE0F8CFCCF1157" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_0DC537EF0205249F7D550F8CFCCD314B" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_115AF2AF07C34E69D3FE0F8CFCCF1157" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_66EC3EE1EED08F2FF8600F8CFCCF44A5" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9901EFCB8F2AF9E720770F8CFCC962FA" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_66EC3EE1EED08F2FF8600F8CFCCF44A5" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_3F72546C61CCE605B06A104ECB096208" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_3ABFFC5DFF9750B18CFF104ECB08DB51" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_3F72546C61CCE605B06A104ECB096208" xlink:to="loc_us-gaap_StatementTable_3ABFFC5DFF9750B18CFF104ECB08DB51" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementScenarioAxis" xlink:label="loc_srt_StatementScenarioAxis_CF1F9A213071A685A07A104ECB08EBF9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_3ABFFC5DFF9750B18CFF104ECB08DB51" xlink:to="loc_srt_StatementScenarioAxis_CF1F9A213071A685A07A104ECB08EBF9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_9C3B5D563D10598324AC104ECB087EF6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_CF1F9A213071A685A07A104ECB08EBF9" xlink:to="loc_srt_ScenarioUnspecifiedDomain_9C3B5D563D10598324AC104ECB087EF6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_9C3B5D563D10598324AC104ECB087EF6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_CF1F9A213071A685A07A104ECB08EBF9" xlink:to="loc_srt_ScenarioUnspecifiedDomain_9C3B5D563D10598324AC104ECB087EF6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_52C930D98F85D31AB330104ECB0904F5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3F72546C61CCE605B06A104ECB096208" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_52C930D98F85D31AB330104ECB0904F5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_0E7F85B174E323E15B2F104ECB09864F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_52C930D98F85D31AB330104ECB0904F5" xlink:to="loc_us-gaap_ProfitLoss_0E7F85B174E323E15B2F104ECB09864F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_CB65BBDCC0675068914A104ECB09B8EA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_52C930D98F85D31AB330104ECB0904F5" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_CB65BBDCC0675068914A104ECB09B8EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DepreciationAmortizationAndAccretionNet" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_0B480DB686819BC173F1104ECB0A7406" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_CB65BBDCC0675068914A104ECB09B8EA" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_0B480DB686819BC173F1104ECB0A7406" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_3C40B53EC63D2F69BE03104ECB0A92EE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_CB65BBDCC0675068914A104ECB09B8EA" xlink:to="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_3C40B53EC63D2F69BE03104ECB0A92EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_23B70B13F879EFA3B615104ECB0AD408" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_CB65BBDCC0675068914A104ECB09B8EA" xlink:to="loc_us-gaap_ShareBasedCompensation_23B70B13F879EFA3B615104ECB0AD408" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_DAE0B7D04ACD4B81C953104ECB0A5DE6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_CB65BBDCC0675068914A104ECB09B8EA" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_DAE0B7D04ACD4B81C953104ECB0A5DE6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_D2151737F708076C370C104ECB0A2377" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_CB65BBDCC0675068914A104ECB09B8EA" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_D2151737F708076C370C104ECB0A2377" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_6ABC7A3F8C3CB7A57763104ECB0A066A" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_CB65BBDCC0675068914A104ECB09B8EA" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_6ABC7A3F8C3CB7A57763104ECB0A066A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments_474041DE3C775F414E67104ECB0BD370" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_CB65BBDCC0675068914A104ECB09B8EA" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments_474041DE3C775F414E67104ECB0BD370" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingAssetsAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_B7E7FBE413658B0875D6104ECB0B880D" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_CB65BBDCC0675068914A104ECB09B8EA" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_B7E7FBE413658B0875D6104ECB0B880D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_CCEDFCC6D3131299A8BC104ECB0B80E8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_B7E7FBE413658B0875D6104ECB0B880D" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_CCEDFCC6D3131299A8BC104ECB0B80E8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_E5190314F1AD33AED969104ECB0B0F68" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_B7E7FBE413658B0875D6104ECB0B880D" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_E5190314F1AD33AED969104ECB0B0F68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_63FC55F904AFB6768308104ECB0B0D5C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_B7E7FBE413658B0875D6104ECB0B880D" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_63FC55F904AFB6768308104ECB0B0D5C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_8C3E9FA1C79A13ACD9C0104ECB0B92C6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_B7E7FBE413658B0875D6104ECB0B880D" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_8C3E9FA1C79A13ACD9C0104ECB0B92C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_A5D168F9DE329E289879104ECB0CEA62" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_CB65BBDCC0675068914A104ECB09B8EA" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_A5D168F9DE329E289879104ECB0CEA62" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_8FCBFBEC4D3F3C9EB4E6104ECB0C9C13" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_A5D168F9DE329E289879104ECB0CEA62" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_8FCBFBEC4D3F3C9EB4E6104ECB0C9C13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_79AE417CA88E5C43A22F104ECB0CDE12" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_A5D168F9DE329E289879104ECB0CEA62" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_79AE417CA88E5C43A22F104ECB0CDE12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredCompensation" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredCompensation_922837FBE28B7A415F93104ECB0C8CBD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_A5D168F9DE329E289879104ECB0CEA62" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredCompensation_922837FBE28B7A415F93104ECB0C8CBD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations" xlink:label="loc_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_EEC0EF82A9E3F097F15D104ECB0C4080" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_A5D168F9DE329E289879104ECB0CEA62" xlink:to="loc_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_EEC0EF82A9E3F097F15D104ECB0C4080" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_150B38F48FE19AA10599104ECB0CDE20" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_A5D168F9DE329E289879104ECB0CEA62" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_150B38F48FE19AA10599104ECB0CDE20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_14245CC8E71ED42C61E3104ECB0D4865" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_CB65BBDCC0675068914A104ECB09B8EA" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_14245CC8E71ED42C61E3104ECB0D4865" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_CB7D54139072D591A1EA104ECB0D42C5" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_52C930D98F85D31AB330104ECB0904F5" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_CB7D54139072D591A1EA104ECB0D42C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D420C3D4B9B693B91FB5104ECB0D648E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3F72546C61CCE605B06A104ECB096208" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D420C3D4B9B693B91FB5104ECB0D648E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_6ABA20FF51337BF8BA2D104ECB0DD30C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D420C3D4B9B693B91FB5104ECB0D648E" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_6ABA20FF51337BF8BA2D104ECB0DD30C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_C8A318DD64DE4B1175A9104ECB0D23D2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D420C3D4B9B693B91FB5104ECB0D648E" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_C8A318DD64DE4B1175A9104ECB0D23D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireShortTermInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_F81781C3CF2200EF6E5E104ECB0EB804" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D420C3D4B9B693B91FB5104ECB0D648E" xlink:to="loc_us-gaap_PaymentsToAcquireShortTermInvestments_F81781C3CF2200EF6E5E104ECB0EB804" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleOfShortTermInvestments" xlink:label="loc_us-gaap_ProceedsFromSaleOfShortTermInvestments_F2FCB3F05347CA77C668104ECB0EEAA6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D420C3D4B9B693B91FB5104ECB0D648E" xlink:to="loc_us-gaap_ProceedsFromSaleOfShortTermInvestments_F2FCB3F05347CA77C668104ECB0EEAA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_10D112941FC169196A1D104ECB0E467B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D420C3D4B9B693B91FB5104ECB0D648E" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_10D112941FC169196A1D104ECB0E467B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7631BF243F76E9AA78AC104ECB0E9DB9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3F72546C61CCE605B06A104ECB096208" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7631BF243F76E9AA78AC104ECB0E9DB9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromNotesPayable" xlink:label="loc_us-gaap_ProceedsFromNotesPayable_A8EC8BDE5BCAFDD60B33104ECB0E3CE9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7631BF243F76E9AA78AC104ECB0E9DB9" xlink:to="loc_us-gaap_ProceedsFromNotesPayable_A8EC8BDE5BCAFDD60B33104ECB0E3CE9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RepaymentsOfSeniorDebt" xlink:label="loc_us-gaap_RepaymentsOfSeniorDebt_745DC1E9F0E5F3D36A26104ECB0F547D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7631BF243F76E9AA78AC104ECB0E9DB9" xlink:to="loc_us-gaap_RepaymentsOfSeniorDebt_745DC1E9F0E5F3D36A26104ECB0F547D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_105F710C996021091718104ECB0FC7D7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7631BF243F76E9AA78AC104ECB0E9DB9" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_105F710C996021091718104ECB0FC7D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_96DA81CF193329E5B77D104ECB0F3375" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7631BF243F76E9AA78AC104ECB0E9DB9" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_96DA81CF193329E5B77D104ECB0F3375" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromPaymentsToMinorityShareholders" xlink:label="loc_us-gaap_ProceedsFromPaymentsToMinorityShareholders_34D931133734B7597C01104ECB0F9C77" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7631BF243F76E9AA78AC104ECB0E9DB9" xlink:to="loc_us-gaap_ProceedsFromPaymentsToMinorityShareholders_34D931133734B7597C01104ECB0F9C77" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_B950B4BEBB295CA5AA48104ECB0FF95A" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_7631BF243F76E9AA78AC104ECB0E9DB9" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_B950B4BEBB295CA5AA48104ECB0FF95A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_373389D97F32DD725E7E104ECB1046BA" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3F72546C61CCE605B06A104ECB096208" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_373389D97F32DD725E7E104ECB1046BA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_53D21A431877CAFC913E104ECB10F043" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3F72546C61CCE605B06A104ECB096208" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_53D21A431877CAFC913E104ECB10F043" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_2B02807C013CD8FA40A9104ECB105702" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3F72546C61CCE605B06A104ECB096208" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_2B02807C013CD8FA40A9104ECB105702" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_E1B7C9A2144B60298EF6104ECB10965D" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3F72546C61CCE605B06A104ECB096208" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_E1B7C9A2144B60298EF6104ECB10965D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestPaidNet" xlink:label="loc_us-gaap_InterestPaidNet_1D958781BCABEDF34FEA104ECB10D4AA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_E1B7C9A2144B60298EF6104ECB10965D" xlink:to="loc_us-gaap_InterestPaidNet_1D958781BCABEDF34FEA104ECB10D4AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_BB6931138E2803B16E69104ECB11F152" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_E1B7C9A2144B60298EF6104ECB10965D" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_BB6931138E2803B16E69104ECB11F152" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_0B760E1D5FFC650B6E30104ECB1155D7" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3F72546C61CCE605B06A104ECB096208" xlink:to="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_0B760E1D5FFC650B6E30104ECB1155D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_86F6E94A955771A6E308104ECB110B8A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_0B760E1D5FFC650B6E30104ECB1155D7" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_86F6E94A955771A6E308104ECB110B8A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_E995AEA9A558C27CFDD7104ECB117F53" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_0B760E1D5FFC650B6E30104ECB1155D7" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_E995AEA9A558C27CFDD7104ECB117F53" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/ConsolidatedStatementsOfOperations" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_E240B3CD690C30140D5FE093F824E935" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_StatementTable_E240B3CD690C30140D5FE093F824E935" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_1343E845A90324D76314E093F8259789" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_E240B3CD690C30140D5FE093F824E935" xlink:to="loc_us-gaap_StatementClassOfStockAxis_1343E845A90324D76314E093F8259789" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_68C99C413A96DDB8C529E093F82596BF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1343E845A90324D76314E093F8259789" xlink:to="loc_us-gaap_ClassOfStockDomain_68C99C413A96DDB8C529E093F82596BF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_68C99C413A96DDB8C529E093F82596BF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1343E845A90324D76314E093F8259789" xlink:to="loc_us-gaap_ClassOfStockDomain_68C99C413A96DDB8C529E093F82596BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_22D9A291B722C39E5BDBE093F826208A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_68C99C413A96DDB8C529E093F82596BF" xlink:to="loc_us-gaap_CommonStockMember_22D9A291B722C39E5BDBE093F826208A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_652EDF180B97EFB086C3E093F8260FCF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_68C99C413A96DDB8C529E093F82596BF" xlink:to="loc_us-gaap_CommonClassBMember_652EDF180B97EFB086C3E093F8260FCF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_066A33A90BD7D11D060CE093F827720C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_066A33A90BD7D11D060CE093F827720C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_3FA7AB6F9325DE47DB0BE093F82782B3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_3FA7AB6F9325DE47DB0BE093F82782B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_38F1AC068C43A359C85CE093F8276D16" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_GrossProfit_38F1AC068C43A359C85CE093F8276D16" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherOperatingIncomeExpenseNet" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseNet_4F095724F70939143CACE09780505D27" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseNet_4F095724F70939143CACE09780505D27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_D8C92BF6CF6C610AAAABE093F828CC3D" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_D8C92BF6CF6C610AAAABE093F828CC3D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_786DA0A90B4944681B04E093F828CF31" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_OperatingIncomeLoss_786DA0A90B4944681B04E093F828CF31" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpenseAbstract" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_673F4FA57B2A1E559316E093F8284107" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_673F4FA57B2A1E559316E093F8284107" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="loc_us-gaap_InvestmentIncomeInterest_B8E51C417EC7833FA412E093F828AC08" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_673F4FA57B2A1E559316E093F8284107" xlink:to="loc_us-gaap_InvestmentIncomeInterest_B8E51C417EC7833FA412E093F828AC08" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpenseDebt" xlink:label="loc_us-gaap_InterestExpenseDebt_E681C3E0DBD997192DACE093F8288FBF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_673F4FA57B2A1E559316E093F8284107" xlink:to="loc_us-gaap_InterestExpenseDebt_E681C3E0DBD997192DACE093F8288FBF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_55AF9B9F4E96215F72FDE093F8286F50" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_673F4FA57B2A1E559316E093F8284107" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_55AF9B9F4E96215F72FDE093F8286F50" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_2CD26C4B179280F19893E093F829EFB2" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_673F4FA57B2A1E559316E093F8284107" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_2CD26C4B179280F19893E093F829EFB2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_A9CA22592B6948603597E093F82992CE" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_673F4FA57B2A1E559316E093F8284107" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_A9CA22592B6948603597E093F82992CE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_655A375378CB19309B38E093F829F471" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_655A375378CB19309B38E093F829F471" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_DAAB606C96AE95E6F201E093F829CF38" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_DAAB606C96AE95E6F201E093F829CF38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_DEC7ECC6D32EB3C3312CE093F8298629" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_ProfitLoss_DEC7ECC6D32EB3C3312CE093F8298629" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_420DF7017D81D79E545AE093F829C181" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_420DF7017D81D79E545AE093F829C181" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_43D10D41B9F7872F3CCDE093F82A13D4" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_NetIncomeLoss_43D10D41B9F7872F3CCDE093F82A13D4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_F54C15828C629824097AE093F82A5A28" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_us-gaap_EarningsPerShareAbstract_F54C15828C629824097AE093F82A5A28" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_618AD0DF6A22C15C28B5E093F82A5A7D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_F54C15828C629824097AE093F82A5A28" xlink:to="loc_us-gaap_EarningsPerShareBasic_618AD0DF6A22C15C28B5E093F82A5A7D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_91AD95512881A09C04E9E093F82A8AF0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_F54C15828C629824097AE093F82A5A28" xlink:to="loc_us-gaap_EarningsPerShareDiluted_91AD95512881A09C04E9E093F82A8AF0" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_WeightedAverageSharesOutstandingAbstract" xlink:label="loc_odc_WeightedAverageSharesOutstandingAbstract_A990CA57DFF9FAC471D4E093F82B14B9" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AC3529047761C27F67F5E093F8263B04" xlink:to="loc_odc_WeightedAverageSharesOutstandingAbstract_A990CA57DFF9FAC471D4E093F82B14B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_9DF24FB21FEA36B2BF11E093F82BB0E9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_odc_WeightedAverageSharesOutstandingAbstract_A990CA57DFF9FAC471D4E093F82B14B9" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_9DF24FB21FEA36B2BF11E093F82BB0E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_556F463A688931F1F85EE093F82BF25F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_odc_WeightedAverageSharesOutstandingAbstract_A990CA57DFF9FAC471D4E093F82B14B9" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_556F463A688931F1F85EE093F82BF25F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/ConsolidatedStatementsOfStockholdersEquityStatement" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_DAD26E01EBF36AA579CD1D67F37F96CC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_StatementTable_DAD26E01EBF36AA579CD1D67F37F96CC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_OwnershipAxis" xlink:label="loc_srt_OwnershipAxis_2B7F665623DA5C5BE04D1D67F37F30BF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_DAD26E01EBF36AA579CD1D67F37F96CC" xlink:to="loc_srt_OwnershipAxis_2B7F665623DA5C5BE04D1D67F37F30BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_OwnershipDomain" xlink:label="loc_srt_OwnershipDomain_4FEA0A83BE1298C41AE61D67F37F9B09_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_2B7F665623DA5C5BE04D1D67F37F30BF" xlink:to="loc_srt_OwnershipDomain_4FEA0A83BE1298C41AE61D67F37F9B09_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_OwnershipDomain" xlink:label="loc_srt_OwnershipDomain_4FEA0A83BE1298C41AE61D67F37F9B09" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_2B7F665623DA5C5BE04D1D67F37F30BF" xlink:to="loc_srt_OwnershipDomain_4FEA0A83BE1298C41AE61D67F37F9B09" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_NoncontrollingInterestAgromexMember" xlink:label="loc_odc_NoncontrollingInterestAgromexMember_FCAD82F50CF88E7540761D67F37FC080" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_4FEA0A83BE1298C41AE61D67F37F9B09" xlink:to="loc_odc_NoncontrollingInterestAgromexMember_FCAD82F50CF88E7540761D67F37FC080" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_ParentOilDriCorporationofAmericaMemberMember" xlink:label="loc_odc_ParentOilDriCorporationofAmericaMemberMember_3503DEBD28D9E68F04D31D67F380115B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_4FEA0A83BE1298C41AE61D67F37F9B09" xlink:to="loc_odc_ParentOilDriCorporationofAmericaMemberMember_3503DEBD28D9E68F04D31D67F380115B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_3E52A8A80E6152F560BD1D67F3807673" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_DAD26E01EBF36AA579CD1D67F37F96CC" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_3E52A8A80E6152F560BD1D67F3807673" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_A57B28B705B3645FD3EC1D67F3801B88_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_3E52A8A80E6152F560BD1D67F3807673" xlink:to="loc_us-gaap_EquityComponentDomain_A57B28B705B3645FD3EC1D67F3801B88_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_A57B28B705B3645FD3EC1D67F3801B88" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_3E52A8A80E6152F560BD1D67F3807673" xlink:to="loc_us-gaap_EquityComponentDomain_A57B28B705B3645FD3EC1D67F3801B88" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_BB89B0077EA5DD71542F1D67F380A492" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_A57B28B705B3645FD3EC1D67F3801B88" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_BB89B0077EA5DD71542F1D67F380A492" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_FF401C80410D2C6FCFBF1D67F381D50D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_A57B28B705B3645FD3EC1D67F3801B88" xlink:to="loc_us-gaap_RetainedEarningsMember_FF401C80410D2C6FCFBF1D67F381D50D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_9BAE15A1BFFD4EF77E851D67F3819854" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_A57B28B705B3645FD3EC1D67F3801B88" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_9BAE15A1BFFD4EF77E851D67F3819854" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_808EBB4913A88246FB5D1D67F38143A3" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_A57B28B705B3645FD3EC1D67F3801B88" xlink:to="loc_us-gaap_NoncontrollingInterestMember_808EBB4913A88246FB5D1D67F38143A3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_48C9017FDD8E808A59C71D67F381CE63" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_A57B28B705B3645FD3EC1D67F3801B88" xlink:to="loc_us-gaap_CommonStockMember_48C9017FDD8E808A59C71D67F381CE63" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_0DB26F3CF3198F0EB2941D67F381E92E" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_A57B28B705B3645FD3EC1D67F3801B88" xlink:to="loc_us-gaap_TreasuryStockMember_0DB26F3CF3198F0EB2941D67F381E92E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_853E08D508ECC4FBD36F1D67F3826A8C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_853E08D508ECC4FBD36F1D67F3826A8C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_3DB4ECE0A911EFFD09781D67F3827B27" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_3DB4ECE0A911EFFD09781D67F3827B27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="loc_us-gaap_TreasuryStockShares_A7E51FBD1D2838E4020E1D67F3825B86" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_TreasuryStockShares_A7E51FBD1D2838E4020E1D67F3825B86" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_DF600908B5245241CB791D67F382B1D8" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_ProfitLoss_DF600908B5245241CB791D67F382B1D8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_F65DC062A999A0D4523D1D67F3834C6B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_F65DC062A999A0D4523D1D67F3834C6B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_463AA1942C7539AA60911D67F3832E3C" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_NetIncomeLoss_463AA1942C7539AA60911D67F3832E3C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_089D83712B8333B4633B1D67F383EF7C" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_089D83712B8333B4633B1D67F383EF7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="loc_us-gaap_DividendsCommonStockCash_410B0E4BA533775D786C1D67F383F207" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_DividendsCommonStockCash_410B0E4BA533775D786C1D67F383F207" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_9C778089C80A4AD94FEF1D67F3835A49" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_9C778089C80A4AD94FEF1D67F3835A49" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_B06BBDEA354F970F7DD61D67F3833686" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_B06BBDEA354F970F7DD61D67F3833686" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_B7927685E714303DE9A31D67F384F84D" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_B7927685E714303DE9A31D67F384F84D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_F3496E3AC92A32A7AE641D67F384124B" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_F3496E3AC92A32A7AE641D67F384124B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition_9CAB6D49B1553DEEA03F1D67F38471C7" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition_9CAB6D49B1553DEEA03F1D67F38471C7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromMinorityShareholders" xlink:label="loc_us-gaap_ProceedsFromMinorityShareholders_8BCDDF2ED7EEEB81052A1D67F384F202" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_ProceedsFromMinorityShareholders_8BCDDF2ED7EEEB81052A1D67F384F202" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_NoncontrollingInterestParentOwnershipPercentagePriortoPurchaseofAdditionalInterest" xlink:label="loc_odc_NoncontrollingInterestParentOwnershipPercentagePriortoPurchaseofAdditionalInterest_7DFFFAE7FEEC5F48E6E61D6CBC13F1DB" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_odc_NoncontrollingInterestParentOwnershipPercentagePriortoPurchaseofAdditionalInterest_7DFFFAE7FEEC5F48E6E61D6CBC13F1DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_A857899BDE9437357A0D1D6CC5F9FDB2" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_A857899BDE9437357A0D1D6CC5F9FDB2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent" xlink:label="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent_1CE4CDE9E893048C90EF1D6CD1578ED9" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent_1CE4CDE9E893048C90EF1D6CD1578ED9" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_NoncontrollingInterestOwnershipPercentagePriortoParentsPurchaseofAdditionalInterest" xlink:label="loc_odc_NoncontrollingInterestOwnershipPercentagePriortoParentsPurchaseofAdditionalInterest_BACFF34C7A061D9D96631D6CDD63C3A1" xlink:type="locator" />
    <link:definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_odc_NoncontrollingInterestOwnershipPercentagePriortoParentsPurchaseofAdditionalInterest_BACFF34C7A061D9D96631D6CDD63C3A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_F831B49394FEF515BC3E1D6CE7B19451" xlink:type="locator" />
    <link:definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E75DC538E21C1B2471771D67F381D3CB" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_F831B49394FEF515BC3E1D6CE7B19451" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/CoverPageCoverPage" xlink:type="extended">
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityInformationLineItems" xlink:label="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:type="locator" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntitiesTable" xlink:label="loc_dei_EntitiesTable_F1AA2BC01064500ED1B30F3D448BC950" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntitiesTable_F1AA2BC01064500ED1B30F3D448BC950" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_0420925DADD37BE028F40F3D448CE542" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_F1AA2BC01064500ED1B30F3D448BC950" xlink:to="loc_us-gaap_StatementClassOfStockAxis_0420925DADD37BE028F40F3D448CE542" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_86EB39024DE9144832600F3D448C2616_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_0420925DADD37BE028F40F3D448CE542" xlink:to="loc_us-gaap_ClassOfStockDomain_86EB39024DE9144832600F3D448C2616_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_86EB39024DE9144832600F3D448C2616" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_0420925DADD37BE028F40F3D448CE542" xlink:to="loc_us-gaap_ClassOfStockDomain_86EB39024DE9144832600F3D448C2616" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_F3575B9AAB54427C2D3F0F3D448C2C24" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_86EB39024DE9144832600F3D448C2616" xlink:to="loc_us-gaap_CommonStockMember_F3575B9AAB54427C2D3F0F3D448C2C24" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_11D726B69196B21F16E80F3D448D3A6D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_86EB39024DE9144832600F3D448C2616" xlink:to="loc_us-gaap_CommonClassBMember_11D726B69196B21F16E80F3D448D3A6D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_6C837FA299367709965A0F3D448DB67B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_86EB39024DE9144832600F3D448C2616" xlink:to="loc_us-gaap_CommonClassAMember_6C837FA299367709965A0F3D448DB67B" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_38EC252CA8E9B0B95DFA0F3D448D835D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_DocumentType_38EC252CA8E9B0B95DFA0F3D448D835D" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentAnnualReport" xlink:label="loc_dei_DocumentAnnualReport_12C1B47271BED4669A850F3D448E14B2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_DocumentAnnualReport_12C1B47271BED4669A850F3D448E14B2" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_45903D46FD13964AD8CC0F3D448E51C9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_DocumentPeriodEndDate_45903D46FD13964AD8CC0F3D448E51C9" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentTransitionReport" xlink:label="loc_dei_DocumentTransitionReport_882FE801A77C815E85500F3D448EAE2C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_DocumentTransitionReport_882FE801A77C815E85500F3D448EAE2C" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityFileNumber" xlink:label="loc_dei_EntityFileNumber_952BEE3BF6DB48012A490F3D448ED787" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityFileNumber_952BEE3BF6DB48012A490F3D448ED787" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_5F0B94F53A03354860400F3D448E17BA" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityRegistrantName_5F0B94F53A03354860400F3D448E17BA" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="loc_dei_EntityIncorporationStateCountryCode_A37D1AFE6C0F4E44139A0F3D448E76B5" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityIncorporationStateCountryCode_A37D1AFE6C0F4E44139A0F3D448E76B5" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityTaxIdentificationNumber" xlink:label="loc_dei_EntityTaxIdentificationNumber_52C97F9E8E58FFFDF14E0F3D448E1CEB" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityTaxIdentificationNumber_52C97F9E8E58FFFDF14E0F3D448E1CEB" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine1" xlink:label="loc_dei_EntityAddressAddressLine1_616168FE2399FCA7CA140F3D448F5A55" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityAddressAddressLine1_616168FE2399FCA7CA140F3D448F5A55" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine2" xlink:label="loc_dei_EntityAddressAddressLine2_ED783CC52A4F8C870BC80F3D448FF58F" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityAddressAddressLine2_ED783CC52A4F8C870BC80F3D448FF58F" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressCityOrTown" xlink:label="loc_dei_EntityAddressCityOrTown_8934E46EBFFA2CD806030F3D448F3BA7" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityAddressCityOrTown_8934E46EBFFA2CD806030F3D448F3BA7" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressStateOrProvince" xlink:label="loc_dei_EntityAddressStateOrProvince_0ECD30FD20F62AE8D90A0F3D448FE6AB" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityAddressStateOrProvince_0ECD30FD20F62AE8D90A0F3D448FE6AB" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressPostalZipCode" xlink:label="loc_dei_EntityAddressPostalZipCode_20DF5C7F3F6EC4DD2B060F3D448F5432" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityAddressPostalZipCode_20DF5C7F3F6EC4DD2B060F3D448F5432" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CityAreaCode" xlink:label="loc_dei_CityAreaCode_075A450E441D6BAD950D0F3D44904057" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_CityAreaCode_075A450E441D6BAD950D0F3D44904057" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LocalPhoneNumber" xlink:label="loc_dei_LocalPhoneNumber_DCCB164305A84F5BB7030F3D44902CDD" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_LocalPhoneNumber_DCCB164305A84F5BB7030F3D44902CDD" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_Security12bTitle" xlink:label="loc_dei_Security12bTitle_F5D11A436F3BDED1948E0F3D44905AB8" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_Security12bTitle_F5D11A436F3BDED1948E0F3D44905AB8" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_TradingSymbol" xlink:label="loc_dei_TradingSymbol_8D3827F558AFC6D87CDF0F3D449042A6" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_TradingSymbol_8D3827F558AFC6D87CDF0F3D449042A6" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SecurityExchangeName" xlink:label="loc_dei_SecurityExchangeName_506D882FEAF86D18B22F0F3D44907E2F" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_SecurityExchangeName_506D882FEAF86D18B22F0F3D44907E2F" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_B6996A6F40C4B10160EF0F3D4490EC42" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_B6996A6F40C4B10160EF0F3D4490EC42" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_dei_EntityVoluntaryFilers_ABEB7516AACB1662CFBB0F3D4491794C" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityVoluntaryFilers_ABEB7516AACB1662CFBB0F3D4491794C" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_1919F1803A130300F5B90F3D44912843" xlink:type="locator" />
    <link:definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityCurrentReportingStatus_1919F1803A130300F5B90F3D44912843" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityInteractiveDataCurrent" xlink:label="loc_dei_EntityInteractiveDataCurrent_2E6B1A431AE165BBECB40F3D4491CF3A" xlink:type="locator" />
    <link:definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityInteractiveDataCurrent_2E6B1A431AE165BBECB40F3D4491CF3A" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_IcfrAuditorAttestationFlag" xlink:label="loc_dei_IcfrAuditorAttestationFlag_00D44E7149BB30F7AFEB0F3D4491B721" xlink:type="locator" />
    <link:definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_IcfrAuditorAttestationFlag_00D44E7149BB30F7AFEB0F3D4491B721" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_85E59DF492AB5ED5966F0F3D44910646" xlink:type="locator" />
    <link:definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityFilerCategory_85E59DF492AB5ED5966F0F3D44910646" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntitySmallBusiness" xlink:label="loc_dei_EntitySmallBusiness_47AE4B8E28AF79B29BCE0F3D4491FA6D" xlink:type="locator" />
    <link:definitionArc order="25" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntitySmallBusiness_47AE4B8E28AF79B29BCE0F3D4491FA6D" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityShellCompany" xlink:label="loc_dei_EntityShellCompany_B24403DCBE9B11C9CBB30F3D449108F9" xlink:type="locator" />
    <link:definitionArc order="26" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityShellCompany_B24403DCBE9B11C9CBB30F3D449108F9" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityPublicFloat" xlink:label="loc_dei_EntityPublicFloat_49949FF0F08BD5C78FCB0F3D449220C9" xlink:type="locator" />
    <link:definitionArc order="27" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityPublicFloat_49949FF0F08BD5C78FCB0F3D449220C9" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_DBBF522F9B051BB07B030F3D4492E717" xlink:type="locator" />
    <link:definitionArc order="28" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_DBBF522F9B051BB07B030F3D4492E717" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_7DD32E41EC92A0963F970F3D4492FD6D" xlink:type="locator" />
    <link:definitionArc order="29" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityCentralIndexKey_7DD32E41EC92A0963F970F3D4492FD6D" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_86A063C0D2765EF389A80F3D44926FF4" xlink:type="locator" />
    <link:definitionArc order="30" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_CurrentFiscalYearEndDate_86A063C0D2765EF389A80F3D44926FF4" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_CCFA1C12ECCF5D2CE3060F3D449236CD" xlink:type="locator" />
    <link:definitionArc order="31" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_DocumentFiscalYearFocus_CCFA1C12ECCF5D2CE3060F3D449236CD" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_291E2A25A76306144B7B0F3D4493B356" xlink:type="locator" />
    <link:definitionArc order="32" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_DocumentFiscalPeriodFocus_291E2A25A76306144B7B0F3D4493B356" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_C3F67443CEFD33ACF52F0F3D44930D44" xlink:type="locator" />
    <link:definitionArc order="33" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_AmendmentFlag_C3F67443CEFD33ACF52F0F3D44930D44" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="loc_dei_EntityEmergingGrowthCompany_8252B9F4D37797A208900F3D54BB5AD9" xlink:type="locator" />
    <link:definitionArc order="34" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1D68B2B2BE1DD978A4660F3D448D63B0" xlink:to="loc_dei_EntityEmergingGrowthCompany_8252B9F4D37797A208900F3D54BB5AD9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/DebtDebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_8D15F7AA637044E3A50410CB5A5AED19" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_us-gaap_DebtInstrumentTable_8D15F7AA637044E3A50410CB5A5AED19" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_6B3587739D05254EC25410CB5A5A61AD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8D15F7AA637044E3A50410CB5A5AED19" xlink:to="loc_us-gaap_DebtInstrumentAxis_6B3587739D05254EC25410CB5A5A61AD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_BAC306DDDD042939A25F10CB5A5B6860_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_6B3587739D05254EC25410CB5A5A61AD" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_BAC306DDDD042939A25F10CB5A5B6860_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_BAC306DDDD042939A25F10CB5A5B6860" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_6B3587739D05254EC25410CB5A5A61AD" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_BAC306DDDD042939A25F10CB5A5B6860" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_8FD4B37E8CDD458A39C510CB5A5B948F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_BAC306DDDD042939A25F10CB5A5B6860" xlink:to="loc_us-gaap_SeniorNotesMember_8FD4B37E8CDD458A39C510CB5A5B948F" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_SeriesBSeniorNotesMember" xlink:label="loc_odc_SeriesBSeniorNotesMember_459A3D573BB28BDE819C10CB5A5B0F3D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_BAC306DDDD042939A25F10CB5A5B6860" xlink:to="loc_odc_SeriesBSeniorNotesMember_459A3D573BB28BDE819C10CB5A5B0F3D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_A7A9BE3E2344F18273F910CB5A5BC765" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_BAC306DDDD042939A25F10CB5A5B6860" xlink:to="loc_us-gaap_LineOfCreditMember_A7A9BE3E2344F18273F910CB5A5BC765" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_C1BD4E9A628DF4A023EC10CB5A5C5EB7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_C1BD4E9A628DF4A023EC10CB5A5C5EB7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RepaymentsOfDebt" xlink:label="loc_us-gaap_RepaymentsOfDebt_421234F9505C0C99974910CB5A5C1EA0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_us-gaap_RepaymentsOfDebt_421234F9505C0C99974910CB5A5C1EA0" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_ShelfNotes" xlink:label="loc_odc_ShelfNotes_44A1473E8D824B6187A910CB5A5C1BAC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_odc_ShelfNotes_44A1473E8D824B6187A910CB5A5C1BAC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityExpirationDate1" xlink:label="loc_us-gaap_LineOfCreditFacilityExpirationDate1_CDD6B5ABF3966743F32610CB5A5CFB38" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_us-gaap_LineOfCreditFacilityExpirationDate1_CDD6B5ABF3966743F32610CB5A5CFB38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_DF96C935E489F6C423AE10CB5A5CDC10" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_DF96C935E489F6C423AE10CB5A5CDC10" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases" xlink:label="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_7E4A00E8150A0505827910CB5A5D7B4F" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_7E4A00E8150A0505827910CB5A5D7B4F" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_LineOfCreditFacilityVariableInterestRatePrimeBased" xlink:label="loc_odc_LineOfCreditFacilityVariableInterestRatePrimeBased_D321BBC3BE45E727B73110CB5A5D921A" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_odc_LineOfCreditFacilityVariableInterestRatePrimeBased_D321BBC3BE45E727B73110CB5A5D921A" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_LineOfCreditFacilityVariableInterestRateLiborBased" xlink:label="loc_odc_LineOfCreditFacilityVariableInterestRateLiborBased_ABA676883DA9218F3CEE10CB5A62A683" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_odc_LineOfCreditFacilityVariableInterestRateLiborBased_ABA676883DA9218F3CEE10CB5A62A683" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_1960FF15F58DA7113C4210CB5A62B636" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_us-gaap_LineOfCredit_1960FF15F58DA7113C4210CB5A62B636" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_Debtinstrumentminimumoverduefinancialobligationconsideredasdefault" xlink:label="loc_odc_Debtinstrumentminimumoverduefinancialobligationconsideredasdefault_4E554F567105DFA4F65F10CB5A627988" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_odc_Debtinstrumentminimumoverduefinancialobligationconsideredasdefault_4E554F567105DFA4F65F10CB5A627988" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_228FCFB9F0F9BC20512910CB5A6361C3" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_228FCFB9F0F9BC20512910CB5A6361C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentMaturityDateRangeStart1" xlink:label="loc_us-gaap_DebtInstrumentMaturityDateRangeStart1_F1D3004F4AB50CFFA73A10CB5A63DD68" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_us-gaap_DebtInstrumentMaturityDateRangeStart1_F1D3004F4AB50CFFA73A10CB5A63DD68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentMaturityDateRangeEnd1" xlink:label="loc_us-gaap_DebtInstrumentMaturityDateRangeEnd1_59056BDB88471981D72E10CB5A63E7CB" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_us-gaap_DebtInstrumentMaturityDateRangeEnd1_59056BDB88471981D72E10CB5A63E7CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_6B421987F6CC29F0E86310CB5A63A0D9" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9CCE6F1BC6182C50AB4110CB5A5B31F6" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_6B421987F6CC29F0E86310CB5A63A0D9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/DebtLevel1Notes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/DebtMaturitiesOfNotesPayableDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_F1C6C5C9D139055D512A104F5CE1BBF2" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_0E644D17930242798EA0104F5CE090C1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_F1C6C5C9D139055D512A104F5CE1BBF2" xlink:to="loc_us-gaap_DebtInstrumentTable_0E644D17930242798EA0104F5CE090C1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_D5B5CE045DBC8DDCAB7B104F5CE11C4D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0E644D17930242798EA0104F5CE090C1" xlink:to="loc_us-gaap_DebtInstrumentAxis_D5B5CE045DBC8DDCAB7B104F5CE11C4D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_120D3FA65277AD160D8C104F5CE1F46A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_D5B5CE045DBC8DDCAB7B104F5CE11C4D" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_120D3FA65277AD160D8C104F5CE1F46A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_120D3FA65277AD160D8C104F5CE1F46A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_D5B5CE045DBC8DDCAB7B104F5CE11C4D" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_120D3FA65277AD160D8C104F5CE1F46A" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_SeriesBSeniorNotesMember" xlink:label="loc_odc_SeriesBSeniorNotesMember_27711DE939BF68EF92C5104F5CE17724" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_120D3FA65277AD160D8C104F5CE1F46A" xlink:to="loc_odc_SeriesBSeniorNotesMember_27711DE939BF68EF92C5104F5CE17724" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_F5DDC9346A5B15D0E397104F5CE270E4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_F1C6C5C9D139055D512A104F5CE1BBF2" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_F5DDC9346A5B15D0E397104F5CE270E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_801BDA421D135C8B0372104F5CE27DA6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_F1C6C5C9D139055D512A104F5CE1BBF2" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_801BDA421D135C8B0372104F5CE27DA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_FBCEE7CBB328787ACA57104F5CE2BF92" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_F1C6C5C9D139055D512A104F5CE1BBF2" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_FBCEE7CBB328787ACA57104F5CE2BF92" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_0017679CD94C940504BF104F5CE240FC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_F1C6C5C9D139055D512A104F5CE1BBF2" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_0017679CD94C940504BF104F5CE240FC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_66EB0211C4E73BE6D851104F5CE211C8" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_F1C6C5C9D139055D512A104F5CE1BBF2" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_66EB0211C4E73BE6D851104F5CE211C8" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/DebtNotesPayableDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_B8F907C579B51C8E871E104F5CE8CB2D" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_7FBDA11D726E3F8A19B6104F5CE6E2FD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B8F907C579B51C8E871E104F5CE8CB2D" xlink:to="loc_us-gaap_DebtInstrumentTable_7FBDA11D726E3F8A19B6104F5CE6E2FD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_E2395F7D3412D2C5E611104F5CE6F532" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_7FBDA11D726E3F8A19B6104F5CE6E2FD" xlink:to="loc_us-gaap_DebtInstrumentAxis_E2395F7D3412D2C5E611104F5CE6F532" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_DB2A6CCAA5B179F00D03104F5CE77DAA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_E2395F7D3412D2C5E611104F5CE6F532" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_DB2A6CCAA5B179F00D03104F5CE77DAA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_DB2A6CCAA5B179F00D03104F5CE77DAA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_E2395F7D3412D2C5E611104F5CE6F532" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_DB2A6CCAA5B179F00D03104F5CE77DAA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_FF3496C9C642A7CCFF46104F5CE716DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_DB2A6CCAA5B179F00D03104F5CE77DAA" xlink:to="loc_us-gaap_SeniorNotesMember_FF3496C9C642A7CCFF46104F5CE716DF" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_SeriesBSeniorNotesMember" xlink:label="loc_odc_SeriesBSeniorNotesMember_6E4B9664BEF34CE59941104F5CE79E0B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_DB2A6CCAA5B179F00D03104F5CE77DAA" xlink:to="loc_odc_SeriesBSeniorNotesMember_6E4B9664BEF34CE59941104F5CE79E0B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_8A0D5A7FF2A0EDD1C2C8104F5CE7907E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_DB2A6CCAA5B179F00D03104F5CE77DAA" xlink:to="loc_us-gaap_LineOfCreditMember_8A0D5A7FF2A0EDD1C2C8104F5CE7907E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorNotes" xlink:label="loc_us-gaap_SeniorNotes_930DF5D3C4A2000EAD84104F5CE8ABFC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B8F907C579B51C8E871E104F5CE8CB2D" xlink:to="loc_us-gaap_SeniorNotes_930DF5D3C4A2000EAD84104F5CE8ABFC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorNotesCurrent" xlink:label="loc_us-gaap_SeniorNotesCurrent_FB5612D34C2A6B620FD0104F5CE88F6C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B8F907C579B51C8E871E104F5CE8CB2D" xlink:to="loc_us-gaap_SeniorNotesCurrent_FB5612D34C2A6B620FD0104F5CE88F6C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredFinanceCostsNet" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_900B1C04FAF3590D4ED2104F5CE885E0" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B8F907C579B51C8E871E104F5CE8CB2D" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_900B1C04FAF3590D4ED2104F5CE885E0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorLongTermNotes" xlink:label="loc_us-gaap_SeniorLongTermNotes_D431E8213657722DF90E104F5CE84D32" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B8F907C579B51C8E871E104F5CE8CB2D" xlink:to="loc_us-gaap_SeniorLongTermNotes_D431E8213657722DF90E104F5CE84D32" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_C0AABD0129E8EDCF4D22104F5CE897CF" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B8F907C579B51C8E871E104F5CE8CB2D" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_C0AABD0129E8EDCF4D22104F5CE897CF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentMaturityDateRangeStart1" xlink:label="loc_us-gaap_DebtInstrumentMaturityDateRangeStart1_26FAAF864001A5929EA9104F5CE9EF20" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B8F907C579B51C8E871E104F5CE8CB2D" xlink:to="loc_us-gaap_DebtInstrumentMaturityDateRangeStart1_26FAAF864001A5929EA9104F5CE9EF20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentMaturityDateRangeEnd1" xlink:label="loc_us-gaap_DebtInstrumentMaturityDateRangeEnd1_EF4002145C9994A6C4FA104F5CE99A7D" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B8F907C579B51C8E871E104F5CE8CB2D" xlink:to="loc_us-gaap_DebtInstrumentMaturityDateRangeEnd1_EF4002145C9994A6C4FA104F5CE99A7D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_8B6BAA4406F0591B54A5104F5CE9FE55" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B8F907C579B51C8E871E104F5CE8CB2D" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_8B6BAA4406F0591B54A5104F5CE9FE55" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/DebtTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/DeferredCompensationDeferredCompAndBonusDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_1E68B57AAC34CFBF0FBEF1A00EB6D311" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable" xlink:label="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable_0DCA5374A8F8618E4963F1A00EAF6D14" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_1E68B57AAC34CFBF0FBEF1A00EB6D311" xlink:to="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable_0DCA5374A8F8618E4963F1A00EAF6D14" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis_B5D482DC59E013F6E274F1A00EB42323" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable_0DCA5374A8F8618E4963F1A00EAF6D14" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis_B5D482DC59E013F6E274F1A00EB42323" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain" xlink:label="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_E166B3E07716F84149F9F1A00EB5FE9B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis_B5D482DC59E013F6E274F1A00EB42323" xlink:to="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_E166B3E07716F84149F9F1A00EB5FE9B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain" xlink:label="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_E166B3E07716F84149F9F1A00EB5FE9B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis_B5D482DC59E013F6E274F1A00EB42323" xlink:to="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_E166B3E07716F84149F9F1A00EB5FE9B" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredCompensationMember" xlink:label="loc_odc_DeferredCompensationMember_26742A56E48CA3A96505F1A00EB5F82C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_E166B3E07716F84149F9F1A00EB5FE9B" xlink:to="loc_odc_DeferredCompensationMember_26742A56E48CA3A96505F1A00EB5F82C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredBonusMember" xlink:label="loc_us-gaap_DeferredBonusMember_BFBCA449FF0EBE25D8CDF1A00EB5A5A9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_E166B3E07716F84149F9F1A00EB5FE9B" xlink:to="loc_us-gaap_DeferredBonusMember_BFBCA449FF0EBE25D8CDF1A00EB5A5A9" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredCompensationAnnualTotal" xlink:label="loc_odc_DeferredCompensationAnnualTotal_92F14B541C1876DCBCB4F1A00EB60DF9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_1E68B57AAC34CFBF0FBEF1A00EB6D311" xlink:to="loc_odc_DeferredCompensationAnnualTotal_92F14B541C1876DCBCB4F1A00EB60DF9" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredCompensationInterestExpense" xlink:label="loc_odc_DeferredCompensationInterestExpense_7E0A145AA7D298B49507F1A00EB6F581" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_1E68B57AAC34CFBF0FBEF1A00EB6D311" xlink:to="loc_odc_DeferredCompensationInterestExpense_7E0A145AA7D298B49507F1A00EB6F581" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualDistributionPaid" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualDistributionPaid_B1F5E23A2E32AFBA0BF9F1A00EB6074C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_1E68B57AAC34CFBF0FBEF1A00EB6D311" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualDistributionPaid_B1F5E23A2E32AFBA0BF9F1A00EB6074C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_9813CC3A5DBE845B2776F1A00EB60C7B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_1E68B57AAC34CFBF0FBEF1A00EB6D311" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_9813CC3A5DBE845B2776F1A00EB60C7B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer_AD954AD0D7B6A8177373F1A00EB69007" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_1E68B57AAC34CFBF0FBEF1A00EB6D311" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer_AD954AD0D7B6A8177373F1A00EB69007" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1_CC37E8B3D3F13FEF1194F1A00EB77671" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_1E68B57AAC34CFBF0FBEF1A00EB6D311" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1_CC37E8B3D3F13FEF1194F1A00EB77671" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/DeferredCompensationLevel1Notes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/DeferredCompensationSerpDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_2FCD9F0A1A8E77B62CCB1D11ED61E0E5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_E96097FEAC4754F1C4591D11ED608772" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_2FCD9F0A1A8E77B62CCB1D11ED61E0E5" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_E96097FEAC4754F1C4591D11ED608772" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_8375900772098088449C1D11ED611712" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_E96097FEAC4754F1C4591D11ED608772" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_8375900772098088449C1D11ED611712" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_AA93CA85B6728E365DD01D11ED61348C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_8375900772098088449C1D11ED611712" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_AA93CA85B6728E365DD01D11ED61348C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_AA93CA85B6728E365DD01D11ED61348C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_8375900772098088449C1D11ED611712" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_AA93CA85B6728E365DD01D11ED61348C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember" xlink:label="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_D56FEC0FFF3D51DB20851D11ED61F009" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_AA93CA85B6728E365DD01D11ED61348C" xlink:to="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_D56FEC0FFF3D51DB20851D11ED61F009" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_690A9DBACDB19B0B4F0E1D11ED617C89" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_2FCD9F0A1A8E77B62CCB1D11ED61E0E5" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_690A9DBACDB19B0B4F0E1D11ED617C89" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_DA67B47E9515ED3511201D11ED62D666" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_2FCD9F0A1A8E77B62CCB1D11ED61E0E5" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_DA67B47E9515ED3511201D11ED62D666" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanCurtailments" xlink:label="loc_us-gaap_DefinedBenefitPlanCurtailments_22C9EA308A3803F31A9F1D11ED62E266" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_2FCD9F0A1A8E77B62CCB1D11ED61E0E5" xlink:to="loc_us-gaap_DefinedBenefitPlanCurtailments_22C9EA308A3803F31A9F1D11ED62E266" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/FinancialInstrumentsFairValuePolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/FinancialInstrumentsLevel1Notes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/FinancialInstrumentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_BB8F1B8072E4BFFC11C84FC58EDD603F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_194C3BDC3AAF632886B64FC58EDC5ADF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_BB8F1B8072E4BFFC11C84FC58EDD603F" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_194C3BDC3AAF632886B64FC58EDC5ADF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_C109E39CFDA3F9C2AC244FC58EDC4838" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_194C3BDC3AAF632886B64FC58EDC5ADF" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_C109E39CFDA3F9C2AC244FC58EDC4838" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D5C4217A96479B1A806A4FC58EDDA343_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_C109E39CFDA3F9C2AC244FC58EDC4838" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D5C4217A96479B1A806A4FC58EDDA343_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D5C4217A96479B1A806A4FC58EDDA343" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_C109E39CFDA3F9C2AC244FC58EDC4838" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D5C4217A96479B1A806A4FC58EDDA343" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_00B37B4D2F87CF9AAACD4FC58EDD7613" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D5C4217A96479B1A806A4FC58EDDA343" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_00B37B4D2F87CF9AAACD4FC58EDD7613" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_B53A35CBE1863377B7174FC58EDD460F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D5C4217A96479B1A806A4FC58EDDA343" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_B53A35CBE1863377B7174FC58EDD460F" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_CashEquivalentsFairValueDisclosure" xlink:label="loc_odc_CashEquivalentsFairValueDisclosure_D28FF856A6F97132843D4FC58EDE8937" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_BB8F1B8072E4BFFC11C84FC58EDD603F" xlink:to="loc_odc_CashEquivalentsFairValueDisclosure_D28FF856A6F97132843D4FC58EDE8937" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtFairValue" xlink:label="loc_us-gaap_LongTermDebtFairValue_43270056A6424ED235DA4FC58EDE5C19" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_BB8F1B8072E4BFFC11C84FC58EDD603F" xlink:to="loc_us-gaap_LongTermDebtFairValue_43270056A6424ED235DA4FC58EDE5C19" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/IncomeTaxesComponentsOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_56A039293764F88CE41FF0C44EFC851D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_StatementTable_56A039293764F88CE41FF0C44EFC851D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredTaxAssetLiabilityAxis" xlink:label="loc_odc_DeferredTaxAssetLiabilityAxis_115CB3D84DCBA2F51293F10136A425E6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_56A039293764F88CE41FF0C44EFC851D" xlink:to="loc_odc_DeferredTaxAssetLiabilityAxis_115CB3D84DCBA2F51293F10136A425E6" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredTaxAssetLiabilityDomain" xlink:label="loc_odc_DeferredTaxAssetLiabilityDomain_E25A6738BE86CBBF07C2F10136AC8994_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_odc_DeferredTaxAssetLiabilityAxis_115CB3D84DCBA2F51293F10136A425E6" xlink:to="loc_odc_DeferredTaxAssetLiabilityDomain_E25A6738BE86CBBF07C2F10136AC8994_default" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredTaxAssetLiabilityDomain" xlink:label="loc_odc_DeferredTaxAssetLiabilityDomain_E25A6738BE86CBBF07C2F10136AC8994" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_odc_DeferredTaxAssetLiabilityAxis_115CB3D84DCBA2F51293F10136A425E6" xlink:to="loc_odc_DeferredTaxAssetLiabilityDomain_E25A6738BE86CBBF07C2F10136AC8994" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredTaxAssetMember" xlink:label="loc_odc_DeferredTaxAssetMember_2D78A466F18C59D3791EF10136AC2580" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_odc_DeferredTaxAssetLiabilityDomain_E25A6738BE86CBBF07C2F10136AC8994" xlink:to="loc_odc_DeferredTaxAssetMember_2D78A466F18C59D3791EF10136AC2580" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredTaxLiabilityMember" xlink:label="loc_odc_DeferredTaxLiabilityMember_E9E913417E05FFA3CD8BF10136ACCF49" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_odc_DeferredTaxAssetLiabilityDomain_E25A6738BE86CBBF07C2F10136AC8994" xlink:to="loc_odc_DeferredTaxLiabilityMember_E9E913417E05FFA3CD8BF10136ACCF49" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_B0002AFE1EC8F781C298F0C44EFD342F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_B0002AFE1EC8F781C298F0C44EFD342F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation_88C06FC6826109F7BF06F0C44EFD66C3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation_88C06FC6826109F7BF06F0C44EFD66C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits_D5DB7D2D624FD51AEBA7F0C44EFD33D1" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits_D5DB7D2D624FD51AEBA7F0C44EFD33D1" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredTaxLiabilitiesLeaserightofuseassets" xlink:label="loc_odc_DeferredTaxLiabilitiesLeaserightofuseassets_2B2940267B5C8FAFD8C4F0EB9E086DD0" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_odc_DeferredTaxLiabilitiesLeaserightofuseassets_2B2940267B5C8FAFD8C4F0EB9E086DD0" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredTaxAssetLeaseLiabilities" xlink:label="loc_odc_DeferredTaxAssetLeaseLiabilities_24DBD2FAABE498B066F9F0FBDF37A1F8" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_odc_DeferredTaxAssetLeaseLiabilities_24DBD2FAABE498B066F9F0FBDF37A1F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts_997E00CC2931F97D0D2FF0C44EFEAD3A" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts_997E00CC2931F97D0D2FF0C44EFEAD3A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilitiesDeferredExpense" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesDeferredExpense_BCEAADEF781EE4B980A3F0C44EFE3974" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesDeferredExpense_BCEAADEF781EE4B980A3F0C44EFE3974" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_17399018DFD90E12C1C9F0C44EFE6D13" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_17399018DFD90E12C1C9F0C44EFE6D13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsOther" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_A18551D57EC4B7E6534CF0C44EFE61DB" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_A18551D57EC4B7E6534CF0C44EFE61DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOther" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_F34122C4EE12CB54673CF0C44EFE956D" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_F34122C4EE12CB54673CF0C44EFE956D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities_F19FB6E6C1AA7E38720AF0C44EFE3972" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities_F19FB6E6C1AA7E38720AF0C44EFE3972" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax_9AF4A823F447AEA79FBBF0C44EFF2044" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax_9AF4A823F447AEA79FBBF0C44EFF2044" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets" xlink:label="loc_us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets_D47833C29084EAD9FE17F0C44EFFAEC5" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets_D47833C29084EAD9FE17F0C44EFFAEC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets_93F15DB339B6D010A3E4F0C44EFF3700" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets_93F15DB339B6D010A3E4F0C44EFF3700" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsInventory" xlink:label="loc_us-gaap_DeferredTaxAssetsInventory_8F97676DCE085FDF173FF0C44EFF5845" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxAssetsInventory_8F97676DCE085FDF173FF0C44EFF5845" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets_9FE7B02326B34B2408D3F0C44EFFA75C" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets_9FE7B02326B34B2408D3F0C44EFFA75C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_A996A846AD32BAEB5072F0C44EFF7372" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_A996A846AD32BAEB5072F0C44EFF7372" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations_E22AA0FAE87BEC0FC6BBF0C44F000611" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations_E22AA0FAE87BEC0FC6BBF0C44F000611" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredTaxAssetLiabilityNetForeignSubsidiaries" xlink:label="loc_odc_DeferredTaxAssetLiabilityNetForeignSubsidiaries_E0B86DBFD1A07F2FAB56F0C44F00FF3D" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_odc_DeferredTaxAssetLiabilityNetForeignSubsidiaries_E0B86DBFD1A07F2FAB56F0C44F00FF3D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_F0CCD53CE885D454B70BF0C44F003BFF" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_F0CCD53CE885D454B70BF0C44F003BFF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsNet" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_D21FB576EDC4EBDB939DF0C44F000E6D" xlink:type="locator" />
    <link:definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_D21FB576EDC4EBDB939DF0C44F000E6D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilities" xlink:label="loc_us-gaap_DeferredTaxLiabilities_8789644D53C13D3A0C6CF0C44F00C9E2" xlink:type="locator" />
    <link:definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_65E203B539869746E95EF0C44EFD25AF" xlink:to="loc_us-gaap_DeferredTaxLiabilities_8789644D53C13D3A0C6CF0C44F00C9E2" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/IncomeTaxesIncomeTaxEffectiveRateReconciliationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_2B6CA94B354ED5C81FD5FE5056307657" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_940AE0C04C1C91D071DDFE505630A6C0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_2B6CA94B354ED5C81FD5FE5056307657" xlink:to="loc_us-gaap_StatementTable_940AE0C04C1C91D071DDFE505630A6C0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementScenarioAxis" xlink:label="loc_srt_StatementScenarioAxis_A11C04F1EC090682DE3FFE5056303F3D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_940AE0C04C1C91D071DDFE505630A6C0" xlink:to="loc_srt_StatementScenarioAxis_A11C04F1EC090682DE3FFE5056303F3D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_22CA1E03A74B0276DD0AFE50563075E0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_A11C04F1EC090682DE3FFE5056303F3D" xlink:to="loc_srt_ScenarioUnspecifiedDomain_22CA1E03A74B0276DD0AFE50563075E0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_22CA1E03A74B0276DD0AFE50563075E0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_A11C04F1EC090682DE3FFE5056303F3D" xlink:to="loc_srt_ScenarioUnspecifiedDomain_22CA1E03A74B0276DD0AFE50563075E0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_976859D287A03A424472FE5056305CF9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2B6CA94B354ED5C81FD5FE5056307657" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_976859D287A03A424472FE5056305CF9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion_09E1900EB9B3A94FC73DFE50563011BB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2B6CA94B354ED5C81FD5FE5056307657" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion_09E1900EB9B3A94FC73DFE50563011BB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_05418C4C91FE2DC3DE07FE505630E631" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2B6CA94B354ED5C81FD5FE5056307657" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_05418C4C91FE2DC3DE07FE505630E631" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_59AA365F5A530A8C56AAFE5056304AD9" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2B6CA94B354ED5C81FD5FE5056307657" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_59AA365F5A530A8C56AAFE5056304AD9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes_4B3F3D8963932777CF22FE505630C20C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2B6CA94B354ED5C81FD5FE5056307657" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes_4B3F3D8963932777CF22FE505630C20C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_FDA6D9548C905B9EE674FE505630CFED" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2B6CA94B354ED5C81FD5FE5056307657" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_FDA6D9548C905B9EE674FE505630CFED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_9AB63BE9C41A1E07B15BFE50563068CF" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2B6CA94B354ED5C81FD5FE5056307657" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_9AB63BE9C41A1E07B15BFE50563068CF" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/IncomeTaxesIncomeTaxProvisionDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_905CC510AF2C703AE7944FC58ED71429" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_4A75C85063A1C90EE2544FC58ED6C512" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_905CC510AF2C703AE7944FC58ED71429" xlink:to="loc_us-gaap_StatementTable_4A75C85063A1C90EE2544FC58ED6C512" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementScenarioAxis" xlink:label="loc_srt_StatementScenarioAxis_B0B65180DF3F26CEC5A14FC58ED61C19" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4A75C85063A1C90EE2544FC58ED6C512" xlink:to="loc_srt_StatementScenarioAxis_B0B65180DF3F26CEC5A14FC58ED61C19" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_E7CEDA94184EF8999D964FC58ED7CAA4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_B0B65180DF3F26CEC5A14FC58ED61C19" xlink:to="loc_srt_ScenarioUnspecifiedDomain_E7CEDA94184EF8999D964FC58ED7CAA4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_E7CEDA94184EF8999D964FC58ED7CAA4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_B0B65180DF3F26CEC5A14FC58ED61C19" xlink:to="loc_srt_ScenarioUnspecifiedDomain_E7CEDA94184EF8999D964FC58ED7CAA4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_56160341FCCEE4036E2F4FC58ED769A2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_905CC510AF2C703AE7944FC58ED71429" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_56160341FCCEE4036E2F4FC58ED769A2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_E97B4D0F163DFE6E3CE44FC58ED75631" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_905CC510AF2C703AE7944FC58ED71429" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_E97B4D0F163DFE6E3CE44FC58ED75631" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_ABBCCCBC7424AA23914B4FC58ED78235" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_905CC510AF2C703AE7944FC58ED71429" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_ABBCCCBC7424AA23914B4FC58ED78235" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_3DBF63EF373E819611DD4FC58ED84B41" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_905CC510AF2C703AE7944FC58ED71429" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_3DBF63EF373E819611DD4FC58ED84B41" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_78779385ED821D436D524FC58ED8EE85" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_905CC510AF2C703AE7944FC58ED71429" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_78779385ED821D436D524FC58ED8EE85" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_CA9A66A21D92D8FF51BD4FC58ED81A1B" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_905CC510AF2C703AE7944FC58ED71429" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_CA9A66A21D92D8FF51BD4FC58ED81A1B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_5E03DD0BACC2874FE78B4FC58ED82413" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_905CC510AF2C703AE7944FC58ED71429" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_5E03DD0BACC2874FE78B4FC58ED82413" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_F4BF54108F2E7E614A0C4FC58ED82EB1" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_905CC510AF2C703AE7944FC58ED71429" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_F4BF54108F2E7E614A0C4FC58ED82EB1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_C3D97E15FD56343D63674FC58ED87205" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_905CC510AF2C703AE7944FC58ED71429" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_C3D97E15FD56343D63674FC58ED87205" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/IncomeTaxesLevel1Notes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_4F5B1BCB9F1F0877E8A6104F5CA5060D" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_C570BAA6A88062931D91104F5CA324A6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4F5B1BCB9F1F0877E8A6104F5CA5060D" xlink:to="loc_us-gaap_StatementTable_C570BAA6A88062931D91104F5CA324A6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredTaxAssetLiabilityAxis" xlink:label="loc_odc_DeferredTaxAssetLiabilityAxis_46B734BE065C2FF30166104F5CA339DB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_C570BAA6A88062931D91104F5CA324A6" xlink:to="loc_odc_DeferredTaxAssetLiabilityAxis_46B734BE065C2FF30166104F5CA339DB" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredTaxAssetLiabilityDomain" xlink:label="loc_odc_DeferredTaxAssetLiabilityDomain_F740F8F32EC65DE8ABC6104F5CA3FCB5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_odc_DeferredTaxAssetLiabilityAxis_46B734BE065C2FF30166104F5CA339DB" xlink:to="loc_odc_DeferredTaxAssetLiabilityDomain_F740F8F32EC65DE8ABC6104F5CA3FCB5_default" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredTaxAssetLiabilityDomain" xlink:label="loc_odc_DeferredTaxAssetLiabilityDomain_F740F8F32EC65DE8ABC6104F5CA3FCB5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_odc_DeferredTaxAssetLiabilityAxis_46B734BE065C2FF30166104F5CA339DB" xlink:to="loc_odc_DeferredTaxAssetLiabilityDomain_F740F8F32EC65DE8ABC6104F5CA3FCB5" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredTaxAssetMember" xlink:label="loc_odc_DeferredTaxAssetMember_21A34077E164366C26AB104F5CA412F4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_odc_DeferredTaxAssetLiabilityDomain_F740F8F32EC65DE8ABC6104F5CA3FCB5" xlink:to="loc_odc_DeferredTaxAssetMember_21A34077E164366C26AB104F5CA412F4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_798A5DBEDE9E60B58371104F5CA44B4E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_C570BAA6A88062931D91104F5CA324A6" xlink:to="loc_srt_RangeAxis_798A5DBEDE9E60B58371104F5CA44B4E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_D13F663C7A01242762BD104F5CA4E812_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_798A5DBEDE9E60B58371104F5CA44B4E" xlink:to="loc_srt_RangeMember_D13F663C7A01242762BD104F5CA4E812_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_D13F663C7A01242762BD104F5CA4E812" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_798A5DBEDE9E60B58371104F5CA44B4E" xlink:to="loc_srt_RangeMember_D13F663C7A01242762BD104F5CA4E812" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_A4D5C3D00124F0AE86FB104F5CA4FE6C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_D13F663C7A01242762BD104F5CA4E812" xlink:to="loc_srt_MinimumMember_A4D5C3D00124F0AE86FB104F5CA4FE6C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_5474E10733537A381DAA104F5CA57B11" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_D13F663C7A01242762BD104F5CA4E812" xlink:to="loc_srt_MaximumMember_5474E10733537A381DAA104F5CA57B11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_5ECD7DDCC7AC6490F238104F5CA525C3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4F5B1BCB9F1F0877E8A6104F5CA5060D" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_5ECD7DDCC7AC6490F238104F5CA525C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="loc_us-gaap_OperatingLossCarryforwards_502D3D887B7FFAED595C104F5CA5B012" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4F5B1BCB9F1F0877E8A6104F5CA5060D" xlink:to="loc_us-gaap_OperatingLossCarryforwards_502D3D887B7FFAED595C104F5CA5B012" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_ADBB4E2979E0033C09DC104F5CA69FD2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4F5B1BCB9F1F0877E8A6104F5CA5060D" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_ADBB4E2979E0033C09DC104F5CA69FD2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_618E2738793E78B5D1EF104F5CA6B3A5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4F5B1BCB9F1F0877E8A6104F5CA5060D" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_618E2738793E78B5D1EF104F5CA6B3A5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_53E03824B351013BE7E7104F5CA618C6" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4F5B1BCB9F1F0877E8A6104F5CA5060D" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_53E03824B351013BE7E7104F5CA618C6" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_ForeignandStateTaxStatuteOfLimitations" xlink:label="loc_odc_ForeignandStateTaxStatuteOfLimitations_4A3D4AD4F047944E0A20104F5CA63BBE" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4F5B1BCB9F1F0877E8A6104F5CA5060D" xlink:to="loc_odc_ForeignandStateTaxStatuteOfLimitations_4A3D4AD4F047944E0A20104F5CA63BBE" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/IncomeTaxesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/LeasesLeaseCostDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/LeasesLesseeOperatingLeaseLiabilityPaymentDueRollingMaturityDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/LeasesLevel1Notes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/LeasesNarrativeDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/LeasesOperatingLeasesFutureMinimumPaymentsDueFiscalYearMaturityDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/LeasesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/OperatingSegmentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_5450D78F28E2E3108C41E099F73260FC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_5450D78F28E2E3108C41E099F73260FC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_AFFF7CDC37B57200AF97E099F732D35C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_5450D78F28E2E3108C41E099F73260FC" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_AFFF7CDC37B57200AF97E099F732D35C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_C64466CD89E2E1522A27E099F7324FEA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_AFFF7CDC37B57200AF97E099F732D35C" xlink:to="loc_us-gaap_SegmentDomain_C64466CD89E2E1522A27E099F7324FEA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_C64466CD89E2E1522A27E099F7324FEA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_AFFF7CDC37B57200AF97E099F732D35C" xlink:to="loc_us-gaap_SegmentDomain_C64466CD89E2E1522A27E099F7324FEA" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_BusinesstoBusinessSegmentMember" xlink:label="loc_odc_BusinesstoBusinessSegmentMember_CDAAFFC5894893682DF1E099F73229D5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_C64466CD89E2E1522A27E099F7324FEA" xlink:to="loc_odc_BusinesstoBusinessSegmentMember_CDAAFFC5894893682DF1E099F73229D5" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_RetailAndWholesaleSegmentMember" xlink:label="loc_odc_RetailAndWholesaleSegmentMember_7662E0F118CE6F6B9880E099F733292B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_C64466CD89E2E1522A27E099F7324FEA" xlink:to="loc_odc_RetailAndWholesaleSegmentMember_7662E0F118CE6F6B9880E099F733292B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MaterialReconcilingItemsMember" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_53C8B37CD2321AB34E39E099F733D9F8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_C64466CD89E2E1522A27E099F7324FEA" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_53C8B37CD2321AB34E39E099F733D9F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_4BF05D505171FF69CEC9E099F7337E43" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_us-gaap_Assets_4BF05D505171FF69CEC9E099F7337E43" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_DC0C64522CD5881395E2E099F734B1A1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_us-gaap_Revenues_DC0C64522CD5881395E2E099F734B1A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_F2B98D77FD21216EF979E099F7343111" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_F2B98D77FD21216EF979E099F7343111" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherOperatingIncomeExpenseNet" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseNet_3A2E0113B4221CFDCCCBE166C69057B5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseNet_3A2E0113B4221CFDCCCBE166C69057B5" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_SegmentReportingInformationOperatingIncomeForReportableSegment" xlink:label="loc_odc_SegmentReportingInformationOperatingIncomeForReportableSegment_33011B9C7B1B26226904E099F73472A1" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_odc_SegmentReportingInformationOperatingIncomeForReportableSegment_33011B9C7B1B26226904E099F73472A1" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_CorporateExpenses" xlink:label="loc_odc_CorporateExpenses_DD140D5B6405C216F9AEE099F73429EA" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_odc_CorporateExpenses_DD140D5B6405C216F9AEE099F73429EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_B3810A9FFC0CC361A813E099F7341F39" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_us-gaap_OperatingIncomeLoss_B3810A9FFC0CC361A813E099F7341F39" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_73526FCD518076DD13BAE099F7347ED6" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_73526FCD518076DD13BAE099F7347ED6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_81FE523C4D79A9E571B5E099F7346BE1" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_81FE523C4D79A9E571B5E099F7346BE1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_83B8CA7E393B3F2C41A5E099F73539F4" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_83B8CA7E393B3F2C41A5E099F73539F4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_14847D17BABA2DE19962E099F7354D91" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_us-gaap_ProfitLoss_14847D17BABA2DE19962E099F7354D91" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_EC9AC57C8BFC49A1338CE099F735A69A" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_EC9AC57C8BFC49A1338CE099F735A69A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_432D2E792ACA53C0F1D2E099F735F5F8" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4599B5C2CE6FE1062B25E099F7338808" xlink:to="loc_us-gaap_NetIncomeLoss_432D2E792ACA53C0F1D2E099F735F5F8" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/OperatingSegmentsDisaggregationOfRevenueDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_4CCF154CF9F75A2A8E364FC58FB4E564" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_5B71CC4FAE3951C35C524FC58FB1E7CC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_4CCF154CF9F75A2A8E364FC58FB4E564" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_5B71CC4FAE3951C35C524FC58FB1E7CC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_AA92FD9C4ABE8621A9034FC58FB1BB3C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_5B71CC4FAE3951C35C524FC58FB1E7CC" xlink:to="loc_srt_ProductOrServiceAxis_AA92FD9C4ABE8621A9034FC58FB1BB3C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_BA6B6E403575A39983114FC58FB1B58E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_AA92FD9C4ABE8621A9034FC58FB1BB3C" xlink:to="loc_srt_ProductsAndServicesDomain_BA6B6E403575A39983114FC58FB1B58E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_BA6B6E403575A39983114FC58FB1B58E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_AA92FD9C4ABE8621A9034FC58FB1BB3C" xlink:to="loc_srt_ProductsAndServicesDomain_BA6B6E403575A39983114FC58FB1B58E" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_CatLitterMember" xlink:label="loc_odc_CatLitterMember_373A08802A436A6C9E2A4FC58FB2515D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_BA6B6E403575A39983114FC58FB1B58E" xlink:to="loc_odc_CatLitterMember_373A08802A436A6C9E2A4FC58FB2515D" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_IndustrialandSportsMember" xlink:label="loc_odc_IndustrialandSportsMember_4E8FD774ACDAE9295CDC4FC58FB2DDF4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_BA6B6E403575A39983114FC58FB1B58E" xlink:to="loc_odc_IndustrialandSportsMember_4E8FD774ACDAE9295CDC4FC58FB2DDF4" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_AgriculturalandHorticulturalMember" xlink:label="loc_odc_AgriculturalandHorticulturalMember_2202EE5FCD5FBC9E2B374FC58FB26D29" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_BA6B6E403575A39983114FC58FB1B58E" xlink:to="loc_odc_AgriculturalandHorticulturalMember_2202EE5FCD5FBC9E2B374FC58FB26D29" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_BleachingClayandFluidsPurificationMember" xlink:label="loc_odc_BleachingClayandFluidsPurificationMember_FC4DDBBE8E05627F3A6B4FC58FB2EC9C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_BA6B6E403575A39983114FC58FB1B58E" xlink:to="loc_odc_BleachingClayandFluidsPurificationMember_FC4DDBBE8E05627F3A6B4FC58FB2EC9C" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_AnimalHealthandNutritionMember" xlink:label="loc_odc_AnimalHealthandNutritionMember_73058318CE1EDE5825274FC58FB21003" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_BA6B6E403575A39983114FC58FB1B58E" xlink:to="loc_odc_AnimalHealthandNutritionMember_73058318CE1EDE5825274FC58FB21003" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_B475900DF26C29D33A634FC58FB34B8A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_5B71CC4FAE3951C35C524FC58FB1E7CC" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_B475900DF26C29D33A634FC58FB34B8A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_1216275C36937FD66C434FC58FB3B278_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_B475900DF26C29D33A634FC58FB34B8A" xlink:to="loc_us-gaap_SegmentDomain_1216275C36937FD66C434FC58FB3B278_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_1216275C36937FD66C434FC58FB3B278" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_B475900DF26C29D33A634FC58FB34B8A" xlink:to="loc_us-gaap_SegmentDomain_1216275C36937FD66C434FC58FB3B278" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_BusinesstoBusinessSegmentMember" xlink:label="loc_odc_BusinesstoBusinessSegmentMember_75EB733A40898E26F16F4FC58FB36947" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1216275C36937FD66C434FC58FB3B278" xlink:to="loc_odc_BusinesstoBusinessSegmentMember_75EB733A40898E26F16F4FC58FB36947" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_RetailAndWholesaleSegmentMember" xlink:label="loc_odc_RetailAndWholesaleSegmentMember_986179878CB263ADF1BF4FC58FB35F13" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1216275C36937FD66C434FC58FB3B278" xlink:to="loc_odc_RetailAndWholesaleSegmentMember_986179878CB263ADF1BF4FC58FB35F13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_9E79C51B52EA4CFC4BC94FC58FB464B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_4CCF154CF9F75A2A8E364FC58FB4E564" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_9E79C51B52EA4CFC4BC94FC58FB464B7" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/OperatingSegmentsFinancialInformationByGeographicRegionDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_533FB90B7C49F9F1CAC2047076D762C6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_E269111BE316F3B61BE2047076D60AEA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_533FB90B7C49F9F1CAC2047076D762C6" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_E269111BE316F3B61BE2047076D60AEA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_3FA8A75AA866ED3261D3047076D6EB76" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_E269111BE316F3B61BE2047076D60AEA" xlink:to="loc_srt_StatementGeographicalAxis_3FA8A75AA866ED3261D3047076D6EB76" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_DFD3037F7561AFD5F944047076D62BDB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_3FA8A75AA866ED3261D3047076D6EB76" xlink:to="loc_srt_SegmentGeographicalDomain_DFD3037F7561AFD5F944047076D62BDB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_DFD3037F7561AFD5F944047076D62BDB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_3FA8A75AA866ED3261D3047076D6EB76" xlink:to="loc_srt_SegmentGeographicalDomain_DFD3037F7561AFD5F944047076D62BDB" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DomesticOperationsMember" xlink:label="loc_odc_DomesticOperationsMember_5240EF2D7F38435C22A3047076D6F75A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_DFD3037F7561AFD5F944047076D62BDB" xlink:to="loc_odc_DomesticOperationsMember_5240EF2D7F38435C22A3047076D6F75A" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_ForeignOperationsMember" xlink:label="loc_odc_ForeignOperationsMember_39B1FB6E763138FAF9AA047076D797A6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_DFD3037F7561AFD5F944047076D62BDB" xlink:to="loc_odc_ForeignOperationsMember_39B1FB6E763138FAF9AA047076D797A6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_00184EC7D539424879CD047076D77297" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_533FB90B7C49F9F1CAC2047076D762C6" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_00184EC7D539424879CD047076D77297" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_SalesOrTransfersBetweenGeographicAreas" xlink:label="loc_odc_SalesOrTransfersBetweenGeographicAreas_4BB0EC78F5C5E641FE25047076D78492" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_533FB90B7C49F9F1CAC2047076D762C6" xlink:to="loc_odc_SalesOrTransfersBetweenGeographicAreas_4BB0EC78F5C5E641FE25047076D78492" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_595F8592E781EEB1315C047076D8C05C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_533FB90B7C49F9F1CAC2047076D762C6" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_595F8592E781EEB1315C047076D8C05C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_184B5BA7E84BD6235B55047076D80261" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_533FB90B7C49F9F1CAC2047076D762C6" xlink:to="loc_us-gaap_NetIncomeLoss_184B5BA7E84BD6235B55047076D80261" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_651E86F1A961A0947F4C047076D88C34" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_533FB90B7C49F9F1CAC2047076D762C6" xlink:to="loc_us-gaap_Assets_651E86F1A961A0947F4C047076D88C34" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/OperatingSegmentsLargestCustomerDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EntityWideRevenueMajorCustomerLineItems" xlink:label="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_387387223BD834BF2F6A4FC58E32B710" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable" xlink:label="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_D06249FDF128BE53B9CE4FC58E30DD30" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_387387223BD834BF2F6A4FC58E32B710" xlink:to="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_D06249FDF128BE53B9CE4FC58E30DD30" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_C483C443C6D9EF6CBB354FC58E305A79" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_D06249FDF128BE53B9CE4FC58E30DD30" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_C483C443C6D9EF6CBB354FC58E305A79" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_71366154D17B5D5C69E24FC58E302F9B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_C483C443C6D9EF6CBB354FC58E305A79" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_71366154D17B5D5C69E24FC58E302F9B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_71366154D17B5D5C69E24FC58E302F9B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_C483C443C6D9EF6CBB354FC58E305A79" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_71366154D17B5D5C69E24FC58E302F9B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SalesRevenueNetMember" xlink:label="loc_us-gaap_SalesRevenueNetMember_A193722ACAAD4D3EB5754FC58E31E34B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_71366154D17B5D5C69E24FC58E302F9B" xlink:to="loc_us-gaap_SalesRevenueNetMember_A193722ACAAD4D3EB5754FC58E31E34B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableMember" xlink:label="loc_us-gaap_AccountsReceivableMember_CACF053A92ADB33E76BA4FC58E3164AF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_71366154D17B5D5C69E24FC58E302F9B" xlink:to="loc_us-gaap_AccountsReceivableMember_CACF053A92ADB33E76BA4FC58E3164AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_07A07429D22C4786CEC74FC58E316057" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_D06249FDF128BE53B9CE4FC58E30DD30" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_07A07429D22C4786CEC74FC58E316057" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_CF81236FA2DE09F3ED2E4FC58E310F39_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_07A07429D22C4786CEC74FC58E316057" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_CF81236FA2DE09F3ED2E4FC58E310F39_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_CF81236FA2DE09F3ED2E4FC58E310F39" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_07A07429D22C4786CEC74FC58E316057" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_CF81236FA2DE09F3ED2E4FC58E310F39" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CustomerConcentrationRiskMember" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_63F3032594C0A69846E34FC58E32E21C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_CF81236FA2DE09F3ED2E4FC58E310F39" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_63F3032594C0A69846E34FC58E32E21C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_6AC8CD0DE3871E6B65634FC58E32CDC7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_387387223BD834BF2F6A4FC58E32B710" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_6AC8CD0DE3871E6B65634FC58E32CDC7" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/OperatingSegmentsLevel1Notes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/OperatingSegmentsLevel2Policy" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/OperatingSegmentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_CC4E3340DC2DFBB57775104F5CF37DBF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_D2119FD0912855020EB0104F5CF2FA35" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_CC4E3340DC2DFBB57775104F5CF37DBF" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_D2119FD0912855020EB0104F5CF2FA35" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_7E9D1939A7864DF05D1E104F5CF22908" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_D2119FD0912855020EB0104F5CF2FA35" xlink:to="loc_srt_StatementGeographicalAxis_7E9D1939A7864DF05D1E104F5CF22908" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_722E07D661FDBAD8EDD9104F5CF2B507_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_7E9D1939A7864DF05D1E104F5CF22908" xlink:to="loc_srt_SegmentGeographicalDomain_722E07D661FDBAD8EDD9104F5CF2B507_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_722E07D661FDBAD8EDD9104F5CF2B507" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_7E9D1939A7864DF05D1E104F5CF22908" xlink:to="loc_srt_SegmentGeographicalDomain_722E07D661FDBAD8EDD9104F5CF2B507" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_ForeignOperationsMember" xlink:label="loc_odc_ForeignOperationsMember_4C675C5B6FFE286FEE31104F5CF298C8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_722E07D661FDBAD8EDD9104F5CF2B507" xlink:to="loc_odc_ForeignOperationsMember_4C675C5B6FFE286FEE31104F5CF298C8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_BC0C1F4D1FC63C4DB9F7104F5CF3E713" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_D2119FD0912855020EB0104F5CF2FA35" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_BC0C1F4D1FC63C4DB9F7104F5CF3E713" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_64BB190B03AFC5B27764104F5CF39271_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_BC0C1F4D1FC63C4DB9F7104F5CF3E713" xlink:to="loc_us-gaap_SegmentDomain_64BB190B03AFC5B27764104F5CF39271_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_64BB190B03AFC5B27764104F5CF39271" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_BC0C1F4D1FC63C4DB9F7104F5CF3E713" xlink:to="loc_us-gaap_SegmentDomain_64BB190B03AFC5B27764104F5CF39271" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="loc_us-gaap_NumberOfReportableSegments_B6A1C7B37CFA2F4CD29E104F5CF3E255" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_CC4E3340DC2DFBB57775104F5CF37DBF" xlink:to="loc_us-gaap_NumberOfReportableSegments_B6A1C7B37CFA2F4CD29E104F5CF3E255" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignFinancialInstitutionsActualDeposits" xlink:label="loc_us-gaap_ForeignFinancialInstitutionsActualDeposits_0818EDB8FB90DED3D546107DCD10DF9E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_CC4E3340DC2DFBB57775104F5CF37DBF" xlink:to="loc_us-gaap_ForeignFinancialInstitutionsActualDeposits_0818EDB8FB90DED3D546107DCD10DF9E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/OperatingSegmentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/OtherContingenciesLevel1Notes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsAmountsRecognizedInConsolidatedBalanceSheetDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_27AFDC2D9726BCE623654FC58E6C9F8F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9C125101147F422B6E204FC58E6AB439" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_27AFDC2D9726BCE623654FC58E6C9F8F" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9C125101147F422B6E204FC58E6AB439" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_784D9A627FD5D1B1D1BC4FC58E6BE409" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9C125101147F422B6E204FC58E6AB439" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_784D9A627FD5D1B1D1BC4FC58E6BE409" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_34CCE68A480EAEBF4E724FC58E6B7335_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_784D9A627FD5D1B1D1BC4FC58E6BE409" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_34CCE68A480EAEBF4E724FC58E6B7335_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_34CCE68A480EAEBF4E724FC58E6B7335" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_784D9A627FD5D1B1D1BC4FC58E6BE409" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_34CCE68A480EAEBF4E724FC58E6B7335" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_5332CD740EB2B4C573F74FC58E6B0ED2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_34CCE68A480EAEBF4E724FC58E6B7335" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_5332CD740EB2B4C573F74FC58E6B0ED2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2CBC64B5B515D580DADC4FC58E6CD864" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_34CCE68A480EAEBF4E724FC58E6B7335" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2CBC64B5B515D580DADC4FC58E6CD864" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DeferredIncomeTax" xlink:label="loc_odc_DeferredIncomeTax_489EA69708ECBB90D7A94FC58E6C7E8B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_27AFDC2D9726BCE623654FC58E6C9F8F" xlink:to="loc_odc_DeferredIncomeTax_489EA69708ECBB90D7A94FC58E6C7E8B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_F6ED0C690415551020284FC58E6CCD90" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_27AFDC2D9726BCE623654FC58E6C9F8F" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_F6ED0C690415551020284FC58E6CCD90" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_000B668D3709AB9CA1CD4FC58E6C6198" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_27AFDC2D9726BCE623654FC58E6C9F8F" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_000B668D3709AB9CA1CD4FC58E6C6198" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax_485A264A087808FAFB064FC58E6C7A4A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_27AFDC2D9726BCE623654FC58E6C9F8F" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax_485A264A087808FAFB064FC58E6C7A4A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax_980A8942A4E0EE5F33364FC58E6DE8D4" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_27AFDC2D9726BCE623654FC58E6C9F8F" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax_980A8942A4E0EE5F33364FC58E6DE8D4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsAmountsRecognizedInOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_AEFDE4A80155B87D7761F1A00F89D6D4" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_71BDC5D7541101E1ED78F1A00F825719" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_AEFDE4A80155B87D7761F1A00F89D6D4" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_71BDC5D7541101E1ED78F1A00F825719" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_E0B16072085E8C1371EDF1A00F88E7C7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_71BDC5D7541101E1ED78F1A00F825719" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_E0B16072085E8C1371EDF1A00F88E7C7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_C74BAB8704F93E4074C4F1A00F88980B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_E0B16072085E8C1371EDF1A00F88E7C7" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_C74BAB8704F93E4074C4F1A00F88980B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_C74BAB8704F93E4074C4F1A00F88980B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_E0B16072085E8C1371EDF1A00F88E7C7" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_C74BAB8704F93E4074C4F1A00F88980B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_42A1B6FEBE49A96F5F48F1A00F88856A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_C74BAB8704F93E4074C4F1A00F88980B" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_42A1B6FEBE49A96F5F48F1A00F88856A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_3F16EC4BD10C77384DB6F1A00F894901" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_C74BAB8704F93E4074C4F1A00F88980B" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_3F16EC4BD10C77384DB6F1A00F894901" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_33185DB7B8E8D2012A3DF1A00F898F27" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_AEFDE4A80155B87D7761F1A00F89D6D4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_33185DB7B8E8D2012A3DF1A00F898F27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_6CDAEAD1CD3F0E3A8ADFF1A00F896531" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_AEFDE4A80155B87D7761F1A00F89D6D4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_6CDAEAD1CD3F0E3A8ADFF1A00F896531" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_9E0F9537A03D802A48EDF1A00F893375" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_AEFDE4A80155B87D7761F1A00F89D6D4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_9E0F9537A03D802A48EDF1A00F893375" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_CombinedSettlementandCurtailmentGainLossafterTax" xlink:label="loc_odc_CombinedSettlementandCurtailmentGainLossafterTax_4CC88A917D42DF395E18F1E2D8D71076" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_AEFDE4A80155B87D7761F1A00F89D6D4" xlink:to="loc_odc_CombinedSettlementandCurtailmentGainLossafterTax_4CC88A917D42DF395E18F1E2D8D71076" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax_D52BA54CFC4DE42F74AEF1CFD3A7331E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_AEFDE4A80155B87D7761F1A00F89D6D4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax_D52BA54CFC4DE42F74AEF1CFD3A7331E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_611D535CB8C8A7E2FF7FF1A00F8A74AE" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_AEFDE4A80155B87D7761F1A00F89D6D4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_611D535CB8C8A7E2FF7FF1A00F8A74AE" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsAmountsToBeRecognizedInOtherComprehensiveIncomeInNextFiscalYearDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_028AE85BE5B2A3ECA59E4FC58EB3FE20" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_3D2E83B4F6BC08EBC0814FC58EB2C865" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_028AE85BE5B2A3ECA59E4FC58EB3FE20" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_3D2E83B4F6BC08EBC0814FC58EB2C865" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_26997FECA2D3429F61F44FC58EB2DBC6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_3D2E83B4F6BC08EBC0814FC58EB2C865" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_26997FECA2D3429F61F44FC58EB2DBC6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_ABCFF102DFECAD9136324FC58EB3AA28_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_26997FECA2D3429F61F44FC58EB2DBC6" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_ABCFF102DFECAD9136324FC58EB3AA28_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_ABCFF102DFECAD9136324FC58EB3AA28" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_26997FECA2D3429F61F44FC58EB2DBC6" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_ABCFF102DFECAD9136324FC58EB3AA28" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_81A9D1A90EBF22BA06574FC58EB3ACDC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_ABCFF102DFECAD9136324FC58EB3AA28" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_81A9D1A90EBF22BA06574FC58EB3ACDC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_383DFEC35CF33733E69F4FC58EB3AF38" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_ABCFF102DFECAD9136324FC58EB3AA28" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_383DFEC35CF33733E69F4FC58EB3AF38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_C9ACBF88E67FD5DBBA8A4FC58EB31576" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_028AE85BE5B2A3ECA59E4FC58EB3FE20" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_C9ACBF88E67FD5DBBA8A4FC58EB31576" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear_B8866195797B977298B84FC58EB478E4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_028AE85BE5B2A3ECA59E4FC58EB3FE20" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear_B8866195797B977298B84FC58EB478E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationNextFiscalYear_521B5F4E470A4E2F2A0B4FC58EB4C1B2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_028AE85BE5B2A3ECA59E4FC58EB3FE20" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationNextFiscalYear_521B5F4E470A4E2F2A0B4FC58EB4C1B2" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsAssumptionsUsedInCalculationsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_B2E75772967093BF1EAD4FC58E490ABF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_D79D4D8077AFC5071BF84FC58E485254" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_B2E75772967093BF1EAD4FC58E490ABF" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_D79D4D8077AFC5071BF84FC58E485254" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_35344C082A6F0653AD364FC58E482406" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_D79D4D8077AFC5071BF84FC58E485254" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_35344C082A6F0653AD364FC58E482406" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_DAC29CBDDED34B9DAD3E4FC58E48A978_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_35344C082A6F0653AD364FC58E482406" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_DAC29CBDDED34B9DAD3E4FC58E48A978_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_DAC29CBDDED34B9DAD3E4FC58E48A978" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_35344C082A6F0653AD364FC58E482406" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_DAC29CBDDED34B9DAD3E4FC58E48A978" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_5C64C694012968780CC04FC58E4875CA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_DAC29CBDDED34B9DAD3E4FC58E48A978" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_5C64C694012968780CC04FC58E4875CA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_E466365EADFA80863F494FC58E491F13" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_DAC29CBDDED34B9DAD3E4FC58E48A978" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_E466365EADFA80863F494FC58E491F13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_4CF3671F3C5F6602115B4FC58E4930A7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_B2E75772967093BF1EAD4FC58E490ABF" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_4CF3671F3C5F6602115B4FC58E4930A7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_594E36749D1EB27020FC4FC58E4970B0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_B2E75772967093BF1EAD4FC58E490ABF" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_594E36749D1EB27020FC4FC58E4970B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_AF504ADD36A0A642C8E24FC58E493A7A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_B2E75772967093BF1EAD4FC58E490ABF" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_AF504ADD36A0A642C8E24FC58E493A7A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease_84C601D8D35D3BAC43A44FC58E4A3A87" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_B2E75772967093BF1EAD4FC58E490ABF" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease_84C601D8D35D3BAC43A44FC58E4A3A87" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_9E13A87ED2F76DB34D914FC58E4A26DE" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_B2E75772967093BF1EAD4FC58E490ABF" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_9E13A87ED2F76DB34D914FC58E4A26DE" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsChangeInBenefitObligationAndPlanAssetsFundedStatusDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0012758D83ABCD8C15271CE92408C4DF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_F78A7F0F00E154101AEE1CE9240520E3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0012758D83ABCD8C15271CE92408C4DF" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_F78A7F0F00E154101AEE1CE9240520E3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_12F09E1E549DEA281A241CE9240649D1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_F78A7F0F00E154101AEE1CE9240520E3" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_12F09E1E549DEA281A241CE9240649D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_529EBF2634DFE0A0E68D1CE92407D10D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_12F09E1E549DEA281A241CE9240649D1" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_529EBF2634DFE0A0E68D1CE92407D10D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_529EBF2634DFE0A0E68D1CE92407D10D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_12F09E1E549DEA281A241CE9240649D1" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_529EBF2634DFE0A0E68D1CE92407D10D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_9A1CD8FED2882662FDF61CE924072133" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_529EBF2634DFE0A0E68D1CE92407D10D" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_9A1CD8FED2882662FDF61CE924072133" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_0D8DFECEE5FD37DBF6821CE92408277A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_529EBF2634DFE0A0E68D1CE92407D10D" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_0D8DFECEE5FD37DBF6821CE92408277A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_86DD21D8E98BEFDD12E11CE92408BD15" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0012758D83ABCD8C15271CE92408C4DF" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_86DD21D8E98BEFDD12E11CE92408BD15" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_DDE73C554C7AA9A176941CE9240ADF73" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_86DD21D8E98BEFDD12E11CE92408BD15" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_DDE73C554C7AA9A176941CE9240ADF73" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_6C96CD92CCE4B25A34C91CE9240A4F4B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_86DD21D8E98BEFDD12E11CE92408BD15" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_6C96CD92CCE4B25A34C91CE9240A4F4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_5C054AF477577E97DEA61CE9240B9902" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_86DD21D8E98BEFDD12E11CE92408BD15" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_5C054AF477577E97DEA61CE9240B9902" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_0702BC5F5D08793825611CE9240BC94B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_86DD21D8E98BEFDD12E11CE92408BD15" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_0702BC5F5D08793825611CE9240BC94B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_74819E3F374A671DEE1A1CE9240B2FDC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_86DD21D8E98BEFDD12E11CE92408BD15" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_74819E3F374A671DEE1A1CE9240B2FDC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanCurtailments" xlink:label="loc_us-gaap_DefinedBenefitPlanCurtailments_737576554382D34282191CE9240B9C31" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_86DD21D8E98BEFDD12E11CE92408BD15" xlink:to="loc_us-gaap_DefinedBenefitPlanCurtailments_737576554382D34282191CE9240B9C31" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligationPaymentForSettlement" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationPaymentForSettlement_F4A27D1D59248106FD4D1CE9240BF684" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_86DD21D8E98BEFDD12E11CE92408BD15" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationPaymentForSettlement_F4A27D1D59248106FD4D1CE9240BF684" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_176829AD75A4EDC088CD1CE9240C36A5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0012758D83ABCD8C15271CE92408C4DF" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_176829AD75A4EDC088CD1CE9240C36A5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_16E198B5E134D245CBC81CE9240C4748" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_176829AD75A4EDC088CD1CE9240C36A5" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_16E198B5E134D245CBC81CE9240C4748" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_EB272C1FB2A22E6DA9BC1CE9240C4BFA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_176829AD75A4EDC088CD1CE9240C36A5" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_EB272C1FB2A22E6DA9BC1CE9240C4BFA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_9C1E5E934C598ABF42EE1CE9240CB6ED" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_176829AD75A4EDC088CD1CE9240C36A5" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_9C1E5E934C598ABF42EE1CE9240CB6ED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_7A7A37A37A81B96140661CE9240C37D7" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_176829AD75A4EDC088CD1CE9240C36A5" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_7A7A37A37A81B96140661CE9240C37D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanSettlementsPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_3F0FA9B06CE754284FA41CE9240D38FD" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_176829AD75A4EDC088CD1CE9240C36A5" xlink:to="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_3F0FA9B06CE754284FA41CE9240D38FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_526F8343F9ADEFACAE6D1CE9240D9447" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0012758D83ABCD8C15271CE92408C4DF" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_526F8343F9ADEFACAE6D1CE9240D9447" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsComponentsOfNetPeriodicBenefitCostDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6D9084A163F3E4679DB5047F641C0011" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9E89D3B845AAAABC85C4047F641A782B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6D9084A163F3E4679DB5047F641C0011" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9E89D3B845AAAABC85C4047F641A782B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_F0CE2E1E027A75A3422D047F641BCCE9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9E89D3B845AAAABC85C4047F641A782B" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_F0CE2E1E027A75A3422D047F641BCCE9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_9B5BA3E00130A9E579A3047F641B0ADD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_F0CE2E1E027A75A3422D047F641BCCE9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_9B5BA3E00130A9E579A3047F641B0ADD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_9B5BA3E00130A9E579A3047F641B0ADD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_F0CE2E1E027A75A3422D047F641BCCE9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_9B5BA3E00130A9E579A3047F641B0ADD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_23A19B9FB74D09B1A680047F641BF54B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_9B5BA3E00130A9E579A3047F641B0ADD" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_23A19B9FB74D09B1A680047F641BF54B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2B5754239E5F4D64A853047F641C2232" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_9B5BA3E00130A9E579A3047F641B0ADD" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2B5754239E5F4D64A853047F641C2232" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_E0CC8485E590AAB99E04047F641C657C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6D9084A163F3E4679DB5047F641C0011" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_E0CC8485E590AAB99E04047F641C657C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_89B336BD786381F04A4C047F641C47E1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6D9084A163F3E4679DB5047F641C0011" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_89B336BD786381F04A4C047F641C47E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_6DBA48996B120FA1C6D5047F641CBDFA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6D9084A163F3E4679DB5047F641C0011" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_6DBA48996B120FA1C6D5047F641CBDFA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_1BB4FB4017AA853CD83A047F641D2308" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6D9084A163F3E4679DB5047F641C0011" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_1BB4FB4017AA853CD83A047F641D2308" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_8D1B538FF73C1AF581C5047F641D3D35" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6D9084A163F3E4679DB5047F641C0011" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_8D1B538FF73C1AF581C5047F641D3D35" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_LumpSumSettlementExpense" xlink:label="loc_odc_LumpSumSettlementExpense_D917EE7DEC46A9BAA8F7047F641D13B9" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6D9084A163F3E4679DB5047F641C0011" xlink:to="loc_odc_LumpSumSettlementExpense_D917EE7DEC46A9BAA8F7047F641D13B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_8A933F50904866134936047F641D7108" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6D9084A163F3E4679DB5047F641C0011" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_8A933F50904866134936047F641D7108" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsEffectOfOnePercentagePointChangeInAssumedHealthcareTrendDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_CA669FDFFC7A1EDCAE994FC58F8B41FF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_81756FD69DCA32FABADD4FC58F8A327C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_CA669FDFFC7A1EDCAE994FC58F8B41FF" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_81756FD69DCA32FABADD4FC58F8A327C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_15D0F50F1CC995ED761F4FC58F8AE673" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_81756FD69DCA32FABADD4FC58F8A327C" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_15D0F50F1CC995ED761F4FC58F8AE673" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_1937A69664AE0961B1844FC58F8AF036_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_15D0F50F1CC995ED761F4FC58F8AE673" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_1937A69664AE0961B1844FC58F8AF036_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_1937A69664AE0961B1844FC58F8AF036" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_15D0F50F1CC995ED761F4FC58F8AE673" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_1937A69664AE0961B1844FC58F8AF036" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_C6669974B58898FBC8494FC58F8B76ED" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_1937A69664AE0961B1844FC58F8AF036" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_C6669974B58898FBC8494FC58F8B76ED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents" xlink:label="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents_FD992FDB36D2C93F89B74FC58F8BC2C9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_CA669FDFFC7A1EDCAE994FC58F8B41FF" xlink:to="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents_FD992FDB36D2C93F89B74FC58F8BC2C9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1" xlink:label="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1_24C325A4846ABEBD5B524FC58F8B6F83" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_CA669FDFFC7A1EDCAE994FC58F8B41FF" xlink:to="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1_24C325A4846ABEBD5B524FC58F8B6F83" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation_5AD68295898E5EBD77284FC58F8CEB07" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_CA669FDFFC7A1EDCAE994FC58F8B41FF" xlink:to="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation_5AD68295898E5EBD77284FC58F8CEB07" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1" xlink:label="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1_062B01A3AD6D87E0DA104FC58F8CD636" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_CA669FDFFC7A1EDCAE994FC58F8B41FF" xlink:to="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1_062B01A3AD6D87E0DA104FC58F8CD636" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsEstimatedFutureBenefitPaymentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A940C4E121C7B2FD2213F1A00F5AF401" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9697FF3246FBF2CFBCB5F1A00F5966C2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A940C4E121C7B2FD2213F1A00F5AF401" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9697FF3246FBF2CFBCB5F1A00F5966C2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_EA83B920CDD0ADB8BB29F1A00F59ACF7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9697FF3246FBF2CFBCB5F1A00F5966C2" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_EA83B920CDD0ADB8BB29F1A00F59ACF7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_D98399C1BF2E22250832F1A00F5AF923_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_EA83B920CDD0ADB8BB29F1A00F59ACF7" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_D98399C1BF2E22250832F1A00F5AF923_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_D98399C1BF2E22250832F1A00F5AF923" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_EA83B920CDD0ADB8BB29F1A00F59ACF7" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_D98399C1BF2E22250832F1A00F5AF923" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_EBF4A5AB5AE1E634F084F1A00F5A5CD7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_D98399C1BF2E22250832F1A00F5AF923" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_EBF4A5AB5AE1E634F084F1A00F5A5CD7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_8F80F4DB646C8B922DFBF1A00F5A53B3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_D98399C1BF2E22250832F1A00F5AF923" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_8F80F4DB646C8B922DFBF1A00F5A53B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_979D20E054603EDEE135F1A00F5A1299" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A940C4E121C7B2FD2213F1A00F5AF401" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_979D20E054603EDEE135F1A00F5A1299" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_2324107C59DC4457F26BF1A00F5BE284" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A940C4E121C7B2FD2213F1A00F5AF401" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_2324107C59DC4457F26BF1A00F5BE284" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_FCAB4A55D6A3549AC41DF1A00F5B97E5" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A940C4E121C7B2FD2213F1A00F5AF401" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_FCAB4A55D6A3549AC41DF1A00F5B97E5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_0472790530DFD09C09E1F1A00F5BD852" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A940C4E121C7B2FD2213F1A00F5AF401" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_0472790530DFD09C09E1F1A00F5BD852" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_4433BF4FA3C5F87971A7F1A00F5B763E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A940C4E121C7B2FD2213F1A00F5AF401" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_4433BF4FA3C5F87971A7F1A00F5B763E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_DFD74E45D32E9536A47CF1A00F5B14F8" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A940C4E121C7B2FD2213F1A00F5AF401" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_DFD74E45D32E9536A47CF1A00F5B14F8" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsFairValueLevelOfPensionPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_907DE0F9F20623DA731DF1A00F07975B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_C678E22BF5D63987AF7CF1A00EFEAF15" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_907DE0F9F20623DA731DF1A00F07975B" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_C678E22BF5D63987AF7CF1A00EFEAF15" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_9D9BEABCD908A7ECB09BF1A00EFE5A71" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_C678E22BF5D63987AF7CF1A00EFEAF15" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_9D9BEABCD908A7ECB09BF1A00EFE5A71" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_AC20A5E6190CDA51DD93F1A00EFE5125_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_9D9BEABCD908A7ECB09BF1A00EFE5A71" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_AC20A5E6190CDA51DD93F1A00EFE5125_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_AC20A5E6190CDA51DD93F1A00EFE5125" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_9D9BEABCD908A7ECB09BF1A00EFE5A71" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_AC20A5E6190CDA51DD93F1A00EFE5125" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_9EC6A416924FBC4398FFF1A00EFFDD38" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_AC20A5E6190CDA51DD93F1A00EFE5125" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_9EC6A416924FBC4398FFF1A00EFFDD38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_8E2E721812056385BF41F1A00EFF0B39" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_C678E22BF5D63987AF7CF1A00EFEAF15" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_8E2E721812056385BF41F1A00EFF0B39" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_8E2E721812056385BF41F1A00EFF0B39" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_8E2E721812056385BF41F1A00EFF0B39" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsMember" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember_44102B39DC4795C5B6CFF1A00EFFAB30" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:to="loc_us-gaap_CashAndCashEquivalentsMember_44102B39DC4795C5B6CFF1A00EFFAB30" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_EquitySecuritiesUSCompaniesMember" xlink:label="loc_odc_EquitySecuritiesUSCompaniesMember_8B5173D83F7BC78DC825F1A00F00EF12" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:to="loc_odc_EquitySecuritiesUSCompaniesMember_8B5173D83F7BC78DC825F1A00F00EF12" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_EquitySecuritiesInternationalCompaniesMember" xlink:label="loc_odc_EquitySecuritiesInternationalCompaniesMember_34D5A2F74A07C2A108B0F1A00F05ACF8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:to="loc_odc_EquitySecuritiesInternationalCompaniesMember_34D5A2F74A07C2A108B0F1A00F05ACF8" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_InternationalEquityMutualFundsDevelopedMarketsMember" xlink:label="loc_odc_InternationalEquityMutualFundsDevelopedMarketsMember_5B55062AF03103E54037F1A00F050CB0" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:to="loc_odc_InternationalEquityMutualFundsDevelopedMarketsMember_5B55062AF03103E54037F1A00F050CB0" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_InternationalEquityMutualFundsEmergingMarketsMember" xlink:label="loc_odc_InternationalEquityMutualFundsEmergingMarketsMember_462A4F2A5471879AE2D4F1A00F05F9AD" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:to="loc_odc_InternationalEquityMutualFundsEmergingMarketsMember_462A4F2A5471879AE2D4F1A00F05F9AD" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_CommodityBasedInvestmentsMember" xlink:label="loc_odc_CommodityBasedInvestmentsMember_9C0B6E4DE70E8CF49B5AF1A00F057280" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:to="loc_odc_CommodityBasedInvestmentsMember_9C0B6E4DE70E8CF49B5AF1A00F057280" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_USTreasurySecuritiesMember" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_FB1F275EC49E8B28755CF1A00F05A16B" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_FB1F275EC49E8B28755CF1A00F05A16B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_48459F7AB7368F09A7F7F1A00F058571" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_48459F7AB7368F09A7F7F1A00F058571" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_AF6B0AD9A2DEEA0C6C81F1A00F05343A" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_AF6B0AD9A2DEEA0C6C81F1A00F05343A" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_FixedIncomeMultistrategybondfundMember" xlink:label="loc_odc_FixedIncomeMultistrategybondfundMember_728FB1E0D077EB6DAEDEF1A00F05337F" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:to="loc_odc_FixedIncomeMultistrategybondfundMember_728FB1E0D077EB6DAEDEF1A00F05337F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="loc_us-gaap_MoneyMarketFundsMember_83F1D1DA8C669C069205F1A00F056D99" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:to="loc_us-gaap_MoneyMarketFundsMember_83F1D1DA8C669C069205F1A00F056D99" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_OtherInvestmentMember" xlink:label="loc_odc_OtherInvestmentMember_888D861D586C109E4471F1A00F06C748" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_663B8D6108207B83CC88F1A00EFFAF23" xlink:to="loc_odc_OtherInvestmentMember_888D861D586C109E4471F1A00F06C748" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_405DFA51DED4700C9E55F1A00F061D42" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_C678E22BF5D63987AF7CF1A00EFEAF15" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_405DFA51DED4700C9E55F1A00F061D42" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_04BAEFCA851C19BF5B29F1A00F0662F6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_405DFA51DED4700C9E55F1A00F061D42" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_04BAEFCA851C19BF5B29F1A00F0662F6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_04BAEFCA851C19BF5B29F1A00F0662F6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_405DFA51DED4700C9E55F1A00F061D42" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_04BAEFCA851C19BF5B29F1A00F0662F6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_2B7EE2C15CA93F733A65F1A00F06FF3B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_04BAEFCA851C19BF5B29F1A00F0662F6" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_2B7EE2C15CA93F733A65F1A00F06FF3B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_560876C1BE4907C3D195F1A00F06A441" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_04BAEFCA851C19BF5B29F1A00F0662F6" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_560876C1BE4907C3D195F1A00F06A441" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_D57CAE5D9AEDB5F4BF69F1A00F0718ED" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_907DE0F9F20623DA731DF1A00F07975B" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_D57CAE5D9AEDB5F4BF69F1A00F0718ED" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_OfFundAssetsInvestedInNonUsStocks" xlink:label="loc_odc_OfFundAssetsInvestedInNonUsStocks_FBEA73B12FFD68585B14F1A00F073CEA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_907DE0F9F20623DA731DF1A00F07975B" xlink:to="loc_odc_OfFundAssetsInvestedInNonUsStocks_FBEA73B12FFD68585B14F1A00F073CEA" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_AmountBackedbyUSGovernment" xlink:label="loc_odc_AmountBackedbyUSGovernment_DD420735536CC2A04E58F1A00F072894" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_907DE0F9F20623DA731DF1A00F07975B" xlink:to="loc_odc_AmountBackedbyUSGovernment_DD420735536CC2A04E58F1A00F072894" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsLevel1Notes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BA3CC7AEC1C5AC59979D047F63DA7698" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_62FCA3D8F7DF2228CD59047F63D93365" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BA3CC7AEC1C5AC59979D047F63DA7698" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_62FCA3D8F7DF2228CD59047F63D93365" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_441DFE212712DFFF5512047F63D9AC13" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_62FCA3D8F7DF2228CD59047F63D93365" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_441DFE212712DFFF5512047F63D9AC13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_794C3C909C5084B75D7C047F63DAD277_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_441DFE212712DFFF5512047F63D9AC13" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_794C3C909C5084B75D7C047F63DAD277_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_794C3C909C5084B75D7C047F63DAD277" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_441DFE212712DFFF5512047F63D9AC13" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_794C3C909C5084B75D7C047F63DAD277" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_2A534CF89D3B1B0E7AED047F63DAFB80" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_794C3C909C5084B75D7C047F63DAD277" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_2A534CF89D3B1B0E7AED047F63DAFB80" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_773DA681B62461CF4C76047F63DA08B1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_794C3C909C5084B75D7C047F63DAD277" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_773DA681B62461CF4C76047F63DA08B1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax_E95E1A9B3D69C8A430CE047F63DB315D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BA3CC7AEC1C5AC59979D047F63DA7698" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax_E95E1A9B3D69C8A430CE047F63DB315D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax_DFDDC6BA540EE00034BA047F63DBB9AE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BA3CC7AEC1C5AC59979D047F63DA7698" xlink:to="loc_us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax_DFDDC6BA540EE00034BA047F63DBB9AE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_8D5035842D5DD19A4966047F63DBF535" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BA3CC7AEC1C5AC59979D047F63DA7698" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_8D5035842D5DD19A4966047F63DBF535" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DefinedBenefitPlanFirstVoluntaryContribution" xlink:label="loc_odc_DefinedBenefitPlanFirstVoluntaryContribution_33B2623BCF47F329BBCD047F63DB092E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BA3CC7AEC1C5AC59979D047F63DA7698" xlink:to="loc_odc_DefinedBenefitPlanFirstVoluntaryContribution_33B2623BCF47F329BBCD047F63DB092E" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DefinedBenefitPlanSecondVoluntaryContribution" xlink:label="loc_odc_DefinedBenefitPlanSecondVoluntaryContribution_3409A0A24068572481E7047F63DBD28E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BA3CC7AEC1C5AC59979D047F63DA7698" xlink:to="loc_odc_DefinedBenefitPlanSecondVoluntaryContribution_3409A0A24068572481E7047F63DBD28E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_BA59564F35CA68AF5D6B047F63DCDDE5" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BA3CC7AEC1C5AC59979D047F63DA7698" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_BA59564F35CA68AF5D6B047F63DCDDE5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear_024CFECA866E3F4FF8A8047F63DCDA20" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BA3CC7AEC1C5AC59979D047F63DA7698" xlink:to="loc_us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear_024CFECA866E3F4FF8A8047F63DCDA20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1" xlink:label="loc_us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1_7EB71DA64D22FBD6BE6F047F63DC61AC" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BA3CC7AEC1C5AC59979D047F63DA7698" xlink:to="loc_us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1_7EB71DA64D22FBD6BE6F047F63DC61AC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate" xlink:label="loc_us-gaap_DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate_8A3076BB1BE039EAD001047F63DC2954" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BA3CC7AEC1C5AC59979D047F63DA7698" xlink:to="loc_us-gaap_DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate_8A3076BB1BE039EAD001047F63DC2954" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedContributionPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_855C827D2B1E2E1610B5047F63DE6F0B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedContributionPlanTable" xlink:label="loc_us-gaap_DefinedContributionPlanTable_295CFC9C6EA3F89B12E8047F63DCA4A8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_855C827D2B1E2E1610B5047F63DE6F0B" xlink:to="loc_us-gaap_DefinedContributionPlanTable_295CFC9C6EA3F89B12E8047F63DCA4A8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTaxStatusAxis" xlink:label="loc_us-gaap_RetirementPlanTaxStatusAxis_26A1E20AE835D4A6FB5E047F63DD71EB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedContributionPlanTable_295CFC9C6EA3F89B12E8047F63DCA4A8" xlink:to="loc_us-gaap_RetirementPlanTaxStatusAxis_26A1E20AE835D4A6FB5E047F63DD71EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTaxStatusDomain" xlink:label="loc_us-gaap_RetirementPlanTaxStatusDomain_2C9FD4EFB288A45474AE047F63DDEFA3_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTaxStatusAxis_26A1E20AE835D4A6FB5E047F63DD71EB" xlink:to="loc_us-gaap_RetirementPlanTaxStatusDomain_2C9FD4EFB288A45474AE047F63DDEFA3_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTaxStatusDomain" xlink:label="loc_us-gaap_RetirementPlanTaxStatusDomain_2C9FD4EFB288A45474AE047F63DDEFA3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTaxStatusAxis_26A1E20AE835D4A6FB5E047F63DD71EB" xlink:to="loc_us-gaap_RetirementPlanTaxStatusDomain_2C9FD4EFB288A45474AE047F63DDEFA3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_QualifiedPlanMember" xlink:label="loc_us-gaap_QualifiedPlanMember_547EBA64DD702E34D793047F63DDECE3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTaxStatusDomain_2C9FD4EFB288A45474AE047F63DDEFA3" xlink:to="loc_us-gaap_QualifiedPlanMember_547EBA64DD702E34D793047F63DDECE3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedContributionPlanCostRecognized" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_A07470FA906FBF771763047F63DE33A2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_855C827D2B1E2E1610B5047F63DE6F0B" xlink:to="loc_us-gaap_DefinedContributionPlanCostRecognized_A07470FA906FBF771763047F63DE33A2" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DefinedContributionPlanEmployerMatchingContributionPercentofMatchBeforeChange" xlink:label="loc_odc_DefinedContributionPlanEmployerMatchingContributionPercentofMatchBeforeChange_E21F5D610B7409AB774C047F63DE3B33" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_855C827D2B1E2E1610B5047F63DE6F0B" xlink:to="loc_odc_DefinedContributionPlanEmployerMatchingContributionPercentofMatchBeforeChange_E21F5D610B7409AB774C047F63DE3B33" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_DefinedContributionPlanEmployerMatchingContributionPercentofEmployeesGrossPayBeforeChange" xlink:label="loc_odc_DefinedContributionPlanEmployerMatchingContributionPercentofEmployeesGrossPayBeforeChange_DD424BCEF9DE6E6415BF047F63DEA5AC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_855C827D2B1E2E1610B5047F63DE6F0B" xlink:to="loc_odc_DefinedContributionPlanEmployerMatchingContributionPercentofEmployeesGrossPayBeforeChange_DD424BCEF9DE6E6415BF047F63DEA5AC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_32CF8D1629A5005C9BCA047F63DEAA10" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_855C827D2B1E2E1610B5047F63DE6F0B" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_32CF8D1629A5005C9BCA047F63DEAA10" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_943D8E986D9A9D70C1CE047F63DF22FA" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_855C827D2B1E2E1610B5047F63DE6F0B" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_943D8E986D9A9D70C1CE047F63DF22FA" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsPlanAssetsAllocationPercentagesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_23788569DCA841313C9F4FC58E8640A3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_236567A5E7163EB6629D4FC58E847043" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_23788569DCA841313C9F4FC58E8640A3" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_236567A5E7163EB6629D4FC58E847043" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_164121325AFF37E39F9F4FC58E84591E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_236567A5E7163EB6629D4FC58E847043" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_164121325AFF37E39F9F4FC58E84591E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_28ADC3A3C9E46185A1BA4FC58E85D1FB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_164121325AFF37E39F9F4FC58E84591E" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_28ADC3A3C9E46185A1BA4FC58E85D1FB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_28ADC3A3C9E46185A1BA4FC58E85D1FB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_164121325AFF37E39F9F4FC58E84591E" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_28ADC3A3C9E46185A1BA4FC58E85D1FB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsMember" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember_C3ECFD9C4994388EA7F34FC58E856FEF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_28ADC3A3C9E46185A1BA4FC58E85D1FB" xlink:to="loc_us-gaap_CashAndCashEquivalentsMember_C3ECFD9C4994388EA7F34FC58E856FEF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FixedIncomeFundsMember" xlink:label="loc_us-gaap_FixedIncomeFundsMember_930DA6EBECDD83D733E64FC58E85AA12" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_28ADC3A3C9E46185A1BA4FC58E85D1FB" xlink:to="loc_us-gaap_FixedIncomeFundsMember_930DA6EBECDD83D733E64FC58E85AA12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_21E5F8AF5A4B34A275D54FC58E85B4E8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_28ADC3A3C9E46185A1BA4FC58E85D1FB" xlink:to="loc_us-gaap_EquitySecuritiesMember_21E5F8AF5A4B34A275D54FC58E85B4E8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_E51DD3FC833A9138B66B4FC58E860E9C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_23788569DCA841313C9F4FC58E8640A3" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_E51DD3FC833A9138B66B4FC58E860E9C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_B8D7C2BF59C50B45C9774FC58E86F617" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_23788569DCA841313C9F4FC58E8640A3" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_B8D7C2BF59C50B45C9774FC58E86F617" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/PensionAndOtherPostretirementBenefitsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_9908DB69DDF7DCFFD93D1D121848DA9D" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_BFDD9972C0409E3713CD1D1218487CA2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_9908DB69DDF7DCFFD93D1D121848DA9D" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_BFDD9972C0409E3713CD1D1218487CA2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_3D1D4B2AFC8236C578C71D121848DAE8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_BFDD9972C0409E3713CD1D1218487CA2" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_3D1D4B2AFC8236C578C71D121848DAE8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_6ECAE1E89C5792167D9C1D12184813E4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_3D1D4B2AFC8236C578C71D121848DAE8" xlink:to="loc_us-gaap_RelatedPartyDomain_6ECAE1E89C5792167D9C1D12184813E4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_6ECAE1E89C5792167D9C1D12184813E4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_3D1D4B2AFC8236C578C71D121848DAE8" xlink:to="loc_us-gaap_RelatedPartyDomain_6ECAE1E89C5792167D9C1D12184813E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_DirectorMember" xlink:label="loc_srt_DirectorMember_2C781C6112256798BC311D1218486E3B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_6ECAE1E89C5792167D9C1D12184813E4" xlink:to="loc_srt_DirectorMember_2C781C6112256798BC311D1218486E3B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromRelatedParties" xlink:label="loc_us-gaap_RevenueFromRelatedParties_393C1D4BBE9A4D10FBAB1D121848828E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_9908DB69DDF7DCFFD93D1D121848DA9D" xlink:to="loc_us-gaap_RevenueFromRelatedParties_393C1D4BBE9A4D10FBAB1D121848828E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableRelatedPartiesCurrent" xlink:label="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_E8B0F648BF873E33A0C51D121848ACEA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_9908DB69DDF7DCFFD93D1D121848DA9D" xlink:to="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_E8B0F648BF873E33A0C51D121848ACEA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty" xlink:label="loc_us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty_6142CD04338FF455AB5C1D121848BCBD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_9908DB69DDF7DCFFD93D1D121848DA9D" xlink:to="loc_us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty_6142CD04338FF455AB5C1D121848BCBD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsPayableRelatedPartiesCurrent" xlink:label="loc_us-gaap_AccountsPayableRelatedPartiesCurrent_984CEB609792A6A9EBBC1D121848B3A5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_9908DB69DDF7DCFFD93D1D121848DA9D" xlink:to="loc_us-gaap_AccountsPayableRelatedPartiesCurrent_984CEB609792A6A9EBBC1D121848B3A5" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/RelatedPartyTransactionsNotes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_CA8FDCE101A2E8165057FC07A6B5758A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_E702E4387945AA5F04BFFC07A6B170CD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_CA8FDCE101A2E8165057FC07A6B5758A" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_E702E4387945AA5F04BFFC07A6B170CD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_9D090B80AA3E7F314421FC07A6B2C7EB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_E702E4387945AA5F04BFFC07A6B170CD" xlink:to="loc_us-gaap_PlanNameAxis_9D090B80AA3E7F314421FC07A6B2C7EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_8E918BA756D8D650783BFC07A6B24F9E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_9D090B80AA3E7F314421FC07A6B2C7EB" xlink:to="loc_us-gaap_PlanNameDomain_8E918BA756D8D650783BFC07A6B24F9E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_8E918BA756D8D650783BFC07A6B24F9E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_9D090B80AA3E7F314421FC07A6B2C7EB" xlink:to="loc_us-gaap_PlanNameDomain_8E918BA756D8D650783BFC07A6B24F9E" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_A2006PlanMember" xlink:label="loc_odc_A2006PlanMember_6D98A010D5FE314B1B22FC07A6B26140" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_8E918BA756D8D650783BFC07A6B24F9E" xlink:to="loc_odc_A2006PlanMember_6D98A010D5FE314B1B22FC07A6B26140" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_A2006PlanRestrictedStockMember" xlink:label="loc_odc_A2006PlanRestrictedStockMember_4CE15678BA922B5596E3FC07A6B3DBB5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_odc_A2006PlanMember_6D98A010D5FE314B1B22FC07A6B26140" xlink:to="loc_odc_A2006PlanRestrictedStockMember_4CE15678BA922B5596E3FC07A6B3DBB5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_6ED79C5E6D741E18EA9BFC07A6B3B58E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_E702E4387945AA5F04BFFC07A6B170CD" xlink:to="loc_srt_RangeAxis_6ED79C5E6D741E18EA9BFC07A6B3B58E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_37BE25501FAF682AFD4CFC07A6B359A2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_6ED79C5E6D741E18EA9BFC07A6B3B58E" xlink:to="loc_srt_RangeMember_37BE25501FAF682AFD4CFC07A6B359A2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_37BE25501FAF682AFD4CFC07A6B359A2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_6ED79C5E6D741E18EA9BFC07A6B3B58E" xlink:to="loc_srt_RangeMember_37BE25501FAF682AFD4CFC07A6B359A2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_BEB8320C58937226D323FC07A6B36619" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_37BE25501FAF682AFD4CFC07A6B359A2" xlink:to="loc_srt_MinimumMember_BEB8320C58937226D323FC07A6B36619" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_1C7F4D42969848DCEF4CFC07A6B43E15" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_37BE25501FAF682AFD4CFC07A6B359A2" xlink:to="loc_srt_MaximumMember_1C7F4D42969848DCEF4CFC07A6B43E15" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_F70377CE16A8FBE9676EFC07A6B4DF49" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_E702E4387945AA5F04BFFC07A6B170CD" xlink:to="loc_us-gaap_AwardTypeAxis_F70377CE16A8FBE9676EFC07A6B4DF49" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B4304FC80B052802A2B6FC07A6B49417_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_F70377CE16A8FBE9676EFC07A6B4DF49" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B4304FC80B052802A2B6FC07A6B49417_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B4304FC80B052802A2B6FC07A6B49417" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_F70377CE16A8FBE9676EFC07A6B4DF49" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B4304FC80B052802A2B6FC07A6B49417" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_A67B5D1E71A1E5021AB1FC07A6B47B5D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B4304FC80B052802A2B6FC07A6B49417" xlink:to="loc_us-gaap_RestrictedStockMember_A67B5D1E71A1E5021AB1FC07A6B47B5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_BF16A2201E10FAC20003FC07A6B53D23" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_CA8FDCE101A2E8165057FC07A6B5758A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_BF16A2201E10FAC20003FC07A6B53D23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_1FCEFD3EF80969A285B7FC07A6B54608" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_CA8FDCE101A2E8165057FC07A6B5758A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_1FCEFD3EF80969A285B7FC07A6B54608" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_2B4C9149856764823BCDFC07A6B59346" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_CA8FDCE101A2E8165057FC07A6B5758A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_2B4C9149856764823BCDFC07A6B59346" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_406ACE1E1137E095329BFC07A6B551B3" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_CA8FDCE101A2E8165057FC07A6B5758A" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_406ACE1E1137E095329BFC07A6B551B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_12D20176D1F193F15ED5FC07A6B5507E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_CA8FDCE101A2E8165057FC07A6B5758A" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_12D20176D1F193F15ED5FC07A6B5507E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/StockBasedCompensationNotes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/StockBasedCompensationStockBasedCompensationPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/StockBasedCompensationSummaryOfOptionActivityDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0C74B3D40B77895466FC4FC58E258EFD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_186594229D4C063BF41F4FC58E24E2BA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0C74B3D40B77895466FC4FC58E258EFD" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_186594229D4C063BF41F4FC58E24E2BA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_C069612F5E26882D4D504FC58E25703F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_186594229D4C063BF41F4FC58E24E2BA" xlink:to="loc_us-gaap_AwardTypeAxis_C069612F5E26882D4D504FC58E25703F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BEF0CC45BA34481F419F4FC58E259A4C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_C069612F5E26882D4D504FC58E25703F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BEF0CC45BA34481F419F4FC58E259A4C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BEF0CC45BA34481F419F4FC58E259A4C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_C069612F5E26882D4D504FC58E25703F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BEF0CC45BA34481F419F4FC58E259A4C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/StockBasedCompensationSummaryOfRestrictedStockActivityDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B14EA7F1FD3B7405FFA9F139ECD2276E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_70399A750C680DDDEF8EF139ECD1CCB5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B14EA7F1FD3B7405FFA9F139ECD2276E" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_70399A750C680DDDEF8EF139ECD1CCB5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_25F1327BBA3F56669BFBF139ECD1C5C0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_70399A750C680DDDEF8EF139ECD1CCB5" xlink:to="loc_us-gaap_AwardTypeAxis_25F1327BBA3F56669BFBF139ECD1C5C0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6BF3BEDA608FF4B6BB87F139ECD213D0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_25F1327BBA3F56669BFBF139ECD1C5C0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6BF3BEDA608FF4B6BB87F139ECD213D0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6BF3BEDA608FF4B6BB87F139ECD213D0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_25F1327BBA3F56669BFBF139ECD1C5C0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6BF3BEDA608FF4B6BB87F139ECD213D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_A4D36D84C01DFCEE7246F139ECD285C6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6BF3BEDA608FF4B6BB87F139ECD213D0" xlink:to="loc_us-gaap_RestrictedStockMember_A4D36D84C01DFCEE7246F139ECD285C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_9CA59431C3AA0A98DC8EF139ECD2AD36" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B14EA7F1FD3B7405FFA9F139ECD2276E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_9CA59431C3AA0A98DC8EF139ECD2AD36" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1175371BDF8A662B6905F139ECD20DF4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B14EA7F1FD3B7405FFA9F139ECD2276E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1175371BDF8A662B6905F139ECD20DF4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_04DABC567CCFCC60BDEDF139ECD3ACE0" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B14EA7F1FD3B7405FFA9F139ECD2276E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_04DABC567CCFCC60BDEDF139ECD3ACE0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_757A9C9E9B8A52B3DDB3F139ECD3083A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B14EA7F1FD3B7405FFA9F139ECD2276E" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_757A9C9E9B8A52B3DDB3F139ECD3083A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_22CC4FE6AD312C587E38F139ECD3760B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B14EA7F1FD3B7405FFA9F139ECD2276E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_22CC4FE6AD312C587E38F139ECD3760B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_47BDD1FD49888525D4B1F139ECD3AF72" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B14EA7F1FD3B7405FFA9F139ECD2276E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_47BDD1FD49888525D4B1F139ECD3AF72" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_D202E3E3D801464C0156F139ECD3DF87" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B14EA7F1FD3B7405FFA9F139ECD2276E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_D202E3E3D801464C0156F139ECD3DF87" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_25C7C4C7527594AF14E3F139ECD42BA1" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B14EA7F1FD3B7405FFA9F139ECD2276E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_25C7C4C7527594AF14E3F139ECD42BA1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_7B41787BB9BAB831D2DBF139ECD4F34E" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B14EA7F1FD3B7405FFA9F139ECD2276E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_7B41787BB9BAB831D2DBF139ECD4F34E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_3E1571F00B2959C128FDF139ECD4818B" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B14EA7F1FD3B7405FFA9F139ECD2276E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_3E1571F00B2959C128FDF139ECD4818B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/StockBasedCompensationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/SubsequentEventsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/SubsequentEventsLevel1Notes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/SubsequentEventsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsAmortizationExpenseDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_A581F437B06EFAE846C0E099F7705555" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_37BAAFB83CBD3D649B47E099F76F58B5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_A581F437B06EFAE846C0E099F7705555" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_37BAAFB83CBD3D649B47E099F76F58B5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D7BB72275F4B0D58D976E099F770C2D4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_37BAAFB83CBD3D649B47E099F76F58B5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D7BB72275F4B0D58D976E099F770C2D4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_E750381D41D7FD84E0A7E099F770E8DE_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D7BB72275F4B0D58D976E099F770C2D4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_E750381D41D7FD84E0A7E099F770E8DE_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_E750381D41D7FD84E0A7E099F770E8DE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D7BB72275F4B0D58D976E099F770C2D4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_E750381D41D7FD84E0A7E099F770E8DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_50314FF7B9BF106E735DE099F7704CEE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_A581F437B06EFAE846C0E099F7705555" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_50314FF7B9BF106E735DE099F7704CEE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_96BED012DDE0B946E701E099F7718807" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_A581F437B06EFAE846C0E099F7705555" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_96BED012DDE0B946E701E099F7718807" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_D99302341AD54E5A7A9FE099F7711AF2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_A581F437B06EFAE846C0E099F7705555" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_D99302341AD54E5A7A9FE099F7711AF2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_A1358C72AA8CC7BB1BBAE099F771B8AD" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_A581F437B06EFAE846C0E099F7705555" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_A1358C72AA8CC7BB1BBAE099F771B8AD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_62DB43B8F16CF0178174E099F7717E3E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_A581F437B06EFAE846C0E099F7705555" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_62DB43B8F16CF0178174E099F7717E3E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsWeightedAverageAmortizationPeriodDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_16AF003251A12CB782BEFE4BD7A9DFB2" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_60406E1120936EFCA10BFE4BD7A92B39" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_16AF003251A12CB782BEFE4BD7A9DFB2" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_60406E1120936EFCA10BFE4BD7A92B39" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_A04354260DC9DB5C1861FE4BD7A9DC3A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_60406E1120936EFCA10BFE4BD7A92B39" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_A04354260DC9DB5C1861FE4BD7A9DC3A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C5F05B4B6E32126D2FACFE4BD7A900CF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_A04354260DC9DB5C1861FE4BD7A9DC3A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C5F05B4B6E32126D2FACFE4BD7A900CF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C5F05B4B6E32126D2FACFE4BD7A900CF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_A04354260DC9DB5C1861FE4BD7A9DC3A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C5F05B4B6E32126D2FACFE4BD7A900CF" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_TrademarksandPatentsMember" xlink:label="loc_odc_TrademarksandPatentsMember_DA76A8CCC9D22AFA01BFFE4BD7A9E673" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C5F05B4B6E32126D2FACFE4BD7A900CF" xlink:to="loc_odc_TrademarksandPatentsMember_DA76A8CCC9D22AFA01BFFE4BD7A9E673" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CustomerListsMember" xlink:label="loc_us-gaap_CustomerListsMember_00BF7D0FA41155BB48EAFE4BD7A9F117" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C5F05B4B6E32126D2FACFE4BD7A900CF" xlink:to="loc_us-gaap_CustomerListsMember_00BF7D0FA41155BB48EAFE4BD7A9F117" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_CF4BCEFCD3733C2755FEFE4BD7A936AC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_16AF003251A12CB782BEFE4BD7A9DFB2" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_CF4BCEFCD3733C2755FEFE4BD7A936AC" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesInventoriesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_59746A7F1B3250BB28564FC58F3DD458" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_53D42D057FEAE2445B8C4FC58F3CFC0E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_59746A7F1B3250BB28564FC58F3DD458" xlink:to="loc_us-gaap_StatementTable_53D42D057FEAE2445B8C4FC58F3CFC0E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementScenarioAxis" xlink:label="loc_srt_StatementScenarioAxis_70B615A9991BD10369E04FC58F3C61D1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_53D42D057FEAE2445B8C4FC58F3CFC0E" xlink:to="loc_srt_StatementScenarioAxis_70B615A9991BD10369E04FC58F3C61D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_F67D1FF75B3752CFB9BC4FC58F3D30E1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_70B615A9991BD10369E04FC58F3C61D1" xlink:to="loc_srt_ScenarioUnspecifiedDomain_F67D1FF75B3752CFB9BC4FC58F3D30E1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_F67D1FF75B3752CFB9BC4FC58F3D30E1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_70B615A9991BD10369E04FC58F3C61D1" xlink:to="loc_srt_ScenarioUnspecifiedDomain_F67D1FF75B3752CFB9BC4FC58F3D30E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryFinishedGoods" xlink:label="loc_us-gaap_InventoryFinishedGoods_EA6184EC94948FBE65F04FC58F3D39D4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59746A7F1B3250BB28564FC58F3DD458" xlink:to="loc_us-gaap_InventoryFinishedGoods_EA6184EC94948FBE65F04FC58F3D39D4" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_PackagingInventory" xlink:label="loc_odc_PackagingInventory_DE451C654B750808CA8F4FC58F3D2D5E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59746A7F1B3250BB28564FC58F3DD458" xlink:to="loc_odc_PackagingInventory_DE451C654B750808CA8F4FC58F3D2D5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherInventory" xlink:label="loc_us-gaap_OtherInventory_2B1C13FF0C20C4B946F44FC58F3E5F9D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59746A7F1B3250BB28564FC58F3DD458" xlink:to="loc_us-gaap_OtherInventory_2B1C13FF0C20C4B946F44FC58F3E5F9D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_046518229142503FC0DE4FC58F3E8979" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_59746A7F1B3250BB28564FC58F3DD458" xlink:to="loc_us-gaap_InventoryNet_046518229142503FC0DE4FC58F3E8979" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesLevel1Notes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesLevel2Policies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesLevel3Tables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_9626EFDD00C711EF95F7104F5D1F09AF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_StatementTable_9626EFDD00C711EF95F7104F5D1F09AF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_62EC20E562A8B97224DD104F5D1F9758" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_9626EFDD00C711EF95F7104F5D1F09AF" xlink:to="loc_us-gaap_InvestmentTypeAxis_62EC20E562A8B97224DD104F5D1F9758" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_E7B5DE8CAA85E35AF195104F5D1F4291_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_62EC20E562A8B97224DD104F5D1F9758" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_E7B5DE8CAA85E35AF195104F5D1F4291_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_E7B5DE8CAA85E35AF195104F5D1F4291" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_62EC20E562A8B97224DD104F5D1F9758" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_E7B5DE8CAA85E35AF195104F5D1F4291" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementScenarioAxis" xlink:label="loc_srt_StatementScenarioAxis_A6D75D92469DECBD6E4E104F5D2024F6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_9626EFDD00C711EF95F7104F5D1F09AF" xlink:to="loc_srt_StatementScenarioAxis_A6D75D92469DECBD6E4E104F5D2024F6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_70E973967BE73F0D0BAF104F5D204528_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_A6D75D92469DECBD6E4E104F5D2024F6" xlink:to="loc_srt_ScenarioUnspecifiedDomain_70E973967BE73F0D0BAF104F5D204528_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_70E973967BE73F0D0BAF104F5D204528" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_A6D75D92469DECBD6E4E104F5D2024F6" xlink:to="loc_srt_ScenarioUnspecifiedDomain_70E973967BE73F0D0BAF104F5D204528" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_2AF0996CB8713A493926104F5D20C786" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_9626EFDD00C711EF95F7104F5D1F09AF" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_2AF0996CB8713A493926104F5D20C786" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_72078D23391D422BB5FA104F5D20A28E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_2AF0996CB8713A493926104F5D20C786" xlink:to="loc_us-gaap_TypeOfAdoptionMember_72078D23391D422BB5FA104F5D20A28E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_72078D23391D422BB5FA104F5D20A28E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_2AF0996CB8713A493926104F5D20C786" xlink:to="loc_us-gaap_TypeOfAdoptionMember_72078D23391D422BB5FA104F5D20A28E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_1AB613B8FDC14A126A12104F5D20A92F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_9626EFDD00C711EF95F7104F5D1F09AF" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_1AB613B8FDC14A126A12104F5D20A92F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_492348E6D4CA13F29947104F5D219AA3_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1AB613B8FDC14A126A12104F5D20A92F" xlink:to="loc_us-gaap_SegmentDomain_492348E6D4CA13F29947104F5D219AA3_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_492348E6D4CA13F29947104F5D219AA3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1AB613B8FDC14A126A12104F5D20A92F" xlink:to="loc_us-gaap_SegmentDomain_492348E6D4CA13F29947104F5D219AA3" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_RetailAndWholesaleSegmentMember" xlink:label="loc_odc_RetailAndWholesaleSegmentMember_FCE06A267EDA140C9267104F5D21EAF0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_492348E6D4CA13F29947104F5D219AA3" xlink:to="loc_odc_RetailAndWholesaleSegmentMember_FCE06A267EDA140C9267104F5D21EAF0" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_BusinesstoBusinessSegmentMember" xlink:label="loc_odc_BusinesstoBusinessSegmentMember_1B6D390153C63A91C522104F5D2159FC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_492348E6D4CA13F29947104F5D219AA3" xlink:to="loc_odc_BusinesstoBusinessSegmentMember_1B6D390153C63A91C522104F5D2159FC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_37350F45443574544F62104F5D21D593" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_9626EFDD00C711EF95F7104F5D1F09AF" xlink:to="loc_srt_RangeAxis_37350F45443574544F62104F5D21D593" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_E890DE48914EE69A932F104F5D22BC3D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_37350F45443574544F62104F5D21D593" xlink:to="loc_srt_RangeMember_E890DE48914EE69A932F104F5D22BC3D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_E890DE48914EE69A932F104F5D22BC3D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_37350F45443574544F62104F5D21D593" xlink:to="loc_srt_RangeMember_E890DE48914EE69A932F104F5D22BC3D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_D05CCE817B4D8F1ECF89104F5D22D2DB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_E890DE48914EE69A932F104F5D22BC3D" xlink:to="loc_srt_MinimumMember_D05CCE817B4D8F1ECF89104F5D22D2DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_640E7E2AA92AD57D4481104F5D22D385" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_E890DE48914EE69A932F104F5D22BC3D" xlink:to="loc_srt_MaximumMember_640E7E2AA92AD57D4481104F5D22D385" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_Cashequivalentsoriginalmaturitymaximum" xlink:label="loc_odc_Cashequivalentsoriginalmaturitymaximum_8A719AEA5638159BF581104F5D22E840" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_odc_Cashequivalentsoriginalmaturitymaximum_8A719AEA5638159BF581104F5D22E840" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_ShorttermInvestmentsOriginalMaturityMaximum" xlink:label="loc_odc_ShorttermInvestmentsOriginalMaturityMaximum_C117720ECDEB40B3A6BD104F5D23D951" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_odc_ShorttermInvestmentsOriginalMaturityMaximum_C117720ECDEB40B3A6BD104F5D23D951" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryValuationReserves" xlink:label="loc_us-gaap_InventoryValuationReserves_9BB41B58D615738326B6104F5D23CDC4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_InventoryValuationReserves_9BB41B58D615738326B6104F5D23CDC4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_3C07A6CE435BCF4F6E7F104F5D2380DE" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_3C07A6CE435BCF4F6E7F104F5D2380DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_18971E84CFD26C56DF3E104F5D233EB9" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_18971E84CFD26C56DF3E104F5D233EB9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IndefiniteLivedTrademarks" xlink:label="loc_us-gaap_IndefiniteLivedTrademarks_003A26D9F09F7FF07A67104F5D2399A5" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_IndefiniteLivedTrademarks_003A26D9F09F7FF07A67104F5D2399A5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_F05F88F44E3107FD3C9D104F5D23FBC5" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_Goodwill_F05F88F44E3107FD3C9D104F5D23FBC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_8DAC5472CC099097D2BF104F5D24AE50" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_8DAC5472CC099097D2BF104F5D24AE50" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_Strippingcosts" xlink:label="loc_odc_Strippingcosts_279EC2C8B91A6F5DA7E6104F5D248FE3" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_odc_Strippingcosts_279EC2C8B91A6F5DA7E6104F5D248FE3" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_Preproductionoverburdenremovalcosts" xlink:label="loc_odc_Preproductionoverburdenremovalcosts_4B8591B617B4AAC31E90104F5D243A4A" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_odc_Preproductionoverburdenremovalcosts_4B8591B617B4AAC31E90104F5D243A4A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Land" xlink:label="loc_us-gaap_Land_D6939D7BB9F0724CD9AE104F5D24BB30" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_Land_D6939D7BB9F0724CD9AE104F5D24BB30" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MineralRights" xlink:label="loc_us-gaap_MineralRights_38FEB1374F946ADC0AB8104F5D24AC30" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_MineralRights_38FEB1374F946ADC0AB8104F5D24AC30" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_Preproductiondevelopmentcosts" xlink:label="loc_odc_Preproductiondevelopmentcosts_F152F0EB03BF71F8EAEF104F5D24E5BE" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_odc_Preproductiondevelopmentcosts_F152F0EB03BF71F8EAEF104F5D24E5BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidRoyalties" xlink:label="loc_us-gaap_PrepaidRoyalties_0A0461C1687D4971420B104F5D25CD69" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_PrepaidRoyalties_0A0461C1687D4971420B104F5D25CD69" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_33513D15DDAD97662720104F5D256649" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_Depreciation_33513D15DDAD97662720104F5D256649" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestCostsCapitalized" xlink:label="loc_us-gaap_InterestCostsCapitalized_2FFAF580B84CE1EED6DB104F5D25CA94" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_InterestCostsCapitalized_2FFAF580B84CE1EED6DB104F5D25CA94" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ImpairmentOfLongLivedAssetsHeldForUse" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_ADACF29D47B417F5F63D104F5D252CA8" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_ADACF29D47B417F5F63D104F5D252CA8" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_CARESActCurrentPayrollTaxDeferral" xlink:label="loc_odc_CARESActCurrentPayrollTaxDeferral_04544D1E720110E0B5F2104F5D255C88" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_odc_CARESActCurrentPayrollTaxDeferral_04544D1E720110E0B5F2104F5D255C88" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_CARESActFuturePayrollTaxDeferral" xlink:label="loc_odc_CARESActFuturePayrollTaxDeferral_5B6688499E93F82E3782104F5D257423" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_odc_CARESActFuturePayrollTaxDeferral_5B6688499E93F82E3782104F5D257423" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MarketingAndAdvertisingExpense" xlink:label="loc_us-gaap_MarketingAndAdvertisingExpense_65006A7986066AEF1EDA104F5D264593" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_MarketingAndAdvertisingExpense_65006A7986066AEF1EDA104F5D264593" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_ShippingandHandlingCosts" xlink:label="loc_odc_ShippingandHandlingCosts_5F4BD9BE239CF714EFEB104F5D2607E9" xlink:type="locator" />
    <link:definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_odc_ShippingandHandlingCosts_5F4BD9BE239CF714EFEB104F5D2607E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_5F1C48F4C0E2BA3969AC104F5D26D7F7" xlink:type="locator" />
    <link:definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_5F1C48F4C0E2BA3969AC104F5D26D7F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherOperatingIncome" xlink:label="loc_us-gaap_OtherOperatingIncome_DEC1FC91DEF48BE49E13104F5D267448" xlink:type="locator" />
    <link:definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_OtherOperatingIncome_DEC1FC91DEF48BE49E13104F5D267448" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_CC9A0A680CBFA822D232104F5D26755F" xlink:type="locator" />
    <link:definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_CC9A0A680CBFA822D232104F5D26755F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_6D18CC8868193B29D898104F5D267369" xlink:type="locator" />
    <link:definitionArc order="25" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDC84F540731F4208259104F5D22D1C2" xlink:to="loc_us-gaap_OperatingLeaseLiability_6D18CC8868193B29D898104F5D267369" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesPropertyPlantAndEquipmentDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A3278D2458A1145A1C084FC58E398B47" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_226E83F507B862143E5E4FC58E362411" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A3278D2458A1145A1C084FC58E398B47" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_226E83F507B862143E5E4FC58E362411" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_B8CB3B807E5977E82F9E4FC58E362AFE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_226E83F507B862143E5E4FC58E362411" xlink:to="loc_srt_RangeAxis_B8CB3B807E5977E82F9E4FC58E362AFE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_12D4670A77D60DA38DF94FC58E370021_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_B8CB3B807E5977E82F9E4FC58E362AFE" xlink:to="loc_srt_RangeMember_12D4670A77D60DA38DF94FC58E370021_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_12D4670A77D60DA38DF94FC58E370021" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_B8CB3B807E5977E82F9E4FC58E362AFE" xlink:to="loc_srt_RangeMember_12D4670A77D60DA38DF94FC58E370021" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_ACFCEED268E560D6B3F34FC58E37C87C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_12D4670A77D60DA38DF94FC58E370021" xlink:to="loc_srt_MinimumMember_ACFCEED268E560D6B3F34FC58E37C87C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_FE7148F1A6875EFEF79D4FC58E37CAF7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_12D4670A77D60DA38DF94FC58E370021" xlink:to="loc_srt_MaximumMember_FE7148F1A6875EFEF79D4FC58E37CAF7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_037C02AC91C1CCA13D664FC58E372532" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_226E83F507B862143E5E4FC58E362411" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_037C02AC91C1CCA13D664FC58E372532" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C3D92D23754A361A11FA4FC58E38A96D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_037C02AC91C1CCA13D664FC58E372532" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C3D92D23754A361A11FA4FC58E38A96D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C3D92D23754A361A11FA4FC58E38A96D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_037C02AC91C1CCA13D664FC58E372532" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C3D92D23754A361A11FA4FC58E38A96D" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_BuildingsAndLeaseholdImprovementsMember" xlink:label="loc_odc_BuildingsAndLeaseholdImprovementsMember_80AAF8A6D3E95B96EC6B4FC58E38F583" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C3D92D23754A361A11FA4FC58E38A96D" xlink:to="loc_odc_BuildingsAndLeaseholdImprovementsMember_80AAF8A6D3E95B96EC6B4FC58E38F583" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquipmentMember" xlink:label="loc_us-gaap_EquipmentMember_A1337C7142AD9AD167F04FC58E381718" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C3D92D23754A361A11FA4FC58E38A96D" xlink:to="loc_us-gaap_EquipmentMember_A1337C7142AD9AD167F04FC58E381718" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherMachineryAndEquipmentMember" xlink:label="loc_us-gaap_OtherMachineryAndEquipmentMember_F49B495E8BF8146342E14FC58E3856C7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C3D92D23754A361A11FA4FC58E38A96D" xlink:to="loc_us-gaap_OtherMachineryAndEquipmentMember_F49B495E8BF8146342E14FC58E3856C7" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_MiningAndOtherMember" xlink:label="loc_odc_MiningAndOtherMember_444AD5DA48E2827F88D44FC58E38D083" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C3D92D23754A361A11FA4FC58E38A96D" xlink:to="loc_odc_MiningAndOtherMember_444AD5DA48E2827F88D44FC58E38D083" xlink:type="arc" />
    <link:loc xlink:href="odc-20200731.xsd#odc_OfficeFurnitureComputersAndEquipmentMember" xlink:label="loc_odc_OfficeFurnitureComputersAndEquipmentMember_98C83457E450551E90064FC58E38B294" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C3D92D23754A361A11FA4FC58E38A96D" xlink:to="loc_odc_OfficeFurnitureComputersAndEquipmentMember_98C83457E450551E90064FC58E38B294" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VehiclesMember" xlink:label="loc_us-gaap_VehiclesMember_B5A62402CE509402D4194FC58E390724" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C3D92D23754A361A11FA4FC58E38A96D" xlink:to="loc_us-gaap_VehiclesMember_B5A62402CE509402D4194FC58E390724" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_3123D7E3E24E8E08EE874FC58E39FF75" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A3278D2458A1145A1C084FC58E398B47" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_3123D7E3E24E8E08EE874FC58E39FF75" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.oildri.com/role/SummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRecognitionMultipleDeliverableArrangementsLineItems" xlink:label="loc_us-gaap_RevenueRecognitionMultipleDeliverableArrangementsLineItems_3640BB874372583B4C874FC58FDCEC5B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredRevenueArrangementByTypeTable" xlink:label="loc_us-gaap_DeferredRevenueArrangementByTypeTable_8639B79B1C4F87FB21444FC58FDB4CB3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRecognitionMultipleDeliverableArrangementsLineItems_3640BB874372583B4C874FC58FDCEC5B" xlink:to="loc_us-gaap_DeferredRevenueArrangementByTypeTable_8639B79B1C4F87FB21444FC58FDB4CB3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredRevenueArrangementTypeAxis" xlink:label="loc_us-gaap_DeferredRevenueArrangementTypeAxis_258FB3564194E5C981864FC58FDBF89A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DeferredRevenueArrangementByTypeTable_8639B79B1C4F87FB21444FC58FDB4CB3" xlink:to="loc_us-gaap_DeferredRevenueArrangementTypeAxis_258FB3564194E5C981864FC58FDBF89A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredRevenueArrangementTypeDomain" xlink:label="loc_us-gaap_DeferredRevenueArrangementTypeDomain_FDAF7236E8B5DE063AEA4FC58FDB2C4D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DeferredRevenueArrangementTypeAxis_258FB3564194E5C981864FC58FDBF89A" xlink:to="loc_us-gaap_DeferredRevenueArrangementTypeDomain_FDAF7236E8B5DE063AEA4FC58FDB2C4D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredRevenueArrangementTypeDomain" xlink:label="loc_us-gaap_DeferredRevenueArrangementTypeDomain_FDAF7236E8B5DE063AEA4FC58FDB2C4D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DeferredRevenueArrangementTypeAxis_258FB3564194E5C981864FC58FDBF89A" xlink:to="loc_us-gaap_DeferredRevenueArrangementTypeDomain_FDAF7236E8B5DE063AEA4FC58FDB2C4D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UpFrontPaymentArrangementMember" xlink:label="loc_us-gaap_UpFrontPaymentArrangementMember_0246C5C2A860D678F4AE4FC58FDCA8F7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredRevenueArrangementTypeDomain_FDAF7236E8B5DE063AEA4FC58FDB2C4D" xlink:to="loc_us-gaap_UpFrontPaymentArrangementMember_0246C5C2A860D678F4AE4FC58FDCA8F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_AAA67773DE5E43C862F04FC58FDCDA54" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRecognitionMultipleDeliverableArrangementsLineItems_3640BB874372583B4C874FC58FDCEC5B" xlink:to="loc_us-gaap_DeferredRevenueCurrent_AAA67773DE5E43C862F04FC58FDCDA54" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredRevenueRevenueRecognized1" xlink:label="loc_us-gaap_DeferredRevenueRevenueRecognized1_71B99D07C3276EBA807A4FC58FDCDC0D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRecognitionMultipleDeliverableArrangementsLineItems_3640BB874372583B4C874FC58FDCEC5B" xlink:to="loc_us-gaap_DeferredRevenueRevenueRecognized1_71B99D07C3276EBA807A4FC58FDCDC0D" xlink:type="arc" />
  </link:definitionLink>
</link:linkbase>
