/di den"deuhm/ , n. , pl. dedenda /-deuh/ . 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).
[ 1900-05; dedere, equiv. to de- DE- + -dere comb. form of dare to give; see ADDENDUM ]