carya glabra

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]

Hickory \Hick"o*ry\, n. [North American Indian pawcohiccora (Capt. J. Smith) a kind of milk or oily liquor pressed from pounded hickory nuts. "Pohickory" is named in a list of Virginia trees, in 1653, and this was finally shortened to "hickory." --J. H. Trumbull.] (Bot.) An American tree of the genus Carya, of which there are several species. The shagbark is the Carya alba, and has a very rough bark; it affords the hickory nut of the markets. The pignut, or brown hickory, is the Carya glabra. The swamp hickory is Carya amara, having a nut whose shell is very thin and the kernel bitter. [1913 Webster]