Pig·nut 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.
 ◄ ►
 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.
 ◄ ►
 Carya glabra
      n : an American hickory tree having bitter nuts [syn: pignut,
          pignut hickory, brown hickory, black hickory]