Definition from Wiktionary, the free dictionary
subderivative (plural subderivatives)
- (linguistics) A word derived indirectly, from a derivative of another.
- "Friendliness" is a subderivative: it is derived from "friendly", which comes from "friend".
- (mathematics) A generalization of the notion of a derivative, defined as the slope of a line that either touches, or is everywhere below the line of a convex function.