Bit·ter·nut, n. Bot. The swamp hickory (Carya amara). Its thin-shelled nuts are bitter.
Hick·o·ry n. 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.
Hickory shad. Zool. (a) The mattowacca, or fall herring. (b) The gizzard shad.