Dictionary
de•den•dum
Pronunciation: (di-den'dum), [key]—
n.,
—pl. -daPronunciation: (-du). [key]
Mach.
(on a gear or rack) the radial distance between the pitch circle or line and the root circle or line. Cf.
addendum (def. 3a).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.