pignut

Groundnut \Ground"nut`\ (ground"n[u^]t`), n. (Bot.) (a) The fruit of the Arachis hypog[ae]a (native country uncertain); the peanut; the earthnut. (b) A leguminous, twining plant (Apios tuberosa), producing clusters of dark purple flowers and having a root tuberous and pleasant to the taste. (c) The dwarf ginseng (Aralia trifolia). [U. S.] --Gray. (d) A European plant of the genus Bunium (B. flexuosum), having an edible root of a globular shape and sweet, aromatic taste; -- called also earthnut, earth chestnut, hawknut, and pignut. [1913 Webster]

Pignut \Pig"nut\ (p[i^]g"n[u^]t), n. (Bot.) (a) See Groundnut (d) . (b) The bitter-flavored nut of a species of hickory (Carya glabra syn. Carya porcina); also, the tree itself. [1913 Webster]