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Definition of Subderivative
1. n. A word derived from a derivative, and not directly from the root; as, "friendliness" is a subderivative, being derived from "friendly", which is in turn a derivative from "friend."
Definition of Subderivative
1. Noun. (linguistics) A word derived indirectly from a derivative of another ¹
2. Noun. (mathematics) The slope of a line that either touches, or is below the line of a convex function ¹
¹ Source: wiktionary.com