Emily Dickinson Lexicon

RUN'CI-NATE, a. [L. runcina, a saw.]

In botany, a runcinate leaf is a sort of pinnatifid leaf, with the lobes convex before and straight behind, like the teeth of a double saw, as in the dandelion. Martyn. A leaf which has sinuses, and of course lobes, that slope backward, is said to be runcinate. Lion toothed; cut into several transverse acute segments, pointing backward. Smith.