dedendum

noun de·den·dum \ də̇ˈdendəm , dēˈ- \

Definition of dedendum

plural -s

: the root of a gear tooth; also : the distance between the dedendum circle and pitch circle of a gear wheel or rack — compare addendum

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Origin and Etymology of dedendum

Latin, neuter of dedendus, gerundive of dedere to give up, deliver, from de from, away + -dere (from dare to give); from the contrast with the addendum of a gear tooth