WordReference Random House Unabridged Dictionary of American English © 2019
de•den•dum  (di dendəm),USA pronunciation n., pl.  -da (-də).USA pronunciation [Mach.]
  1. Mechanical Engineering(on a gear or rack) the radial distance between the pitch circle or line and the root circle or line. Cf. addendum (def. 3a).
  • Latin: to be given up, gerund, gerundive of dēdere, equivalent. to dē- de- + -dere combining form of dare to give; see addendum
  • 1900–05

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