Dictionaryde•den•dumPronunciation: (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.
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