Ag'nus Cās'tus, n.

n. [Gr. ἄγνος, a willow-like tree, associated with the notion of chastity from the similarity of its name to the Gr. ἁγνός, chaste.] (Bot.) A species of Vitex (V. agnus castus); the chaste-tree. Loudon. “And wreaths of agnus castus others bore.” Dryden.