Bit·ter·nut, n. Bot. The swamp hickory (Carya amara). Its thin-shelled nuts are bitter.
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  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.
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