carya amara

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.
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   {Hickory shad}. (Zool.)
   (a) The mattowacca, or fall herring.
   (b) The gizzard shad.
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Bitternut \Bit"ter*nut"\, n. (Bot.)
   The swamp hickory ({Carya amara}). Its thin-shelled nuts are
   bitter.
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