Bit·ter·nut, n. Bot. The swamp hickory (Carya amara). Its thin-shelled nuts are bitter.
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bitternut
n : hickory of the eastern United States having a leaves with 7
or 9 leaflets and thin-shelled very bitter nuts [syn: bitternut
hickory, bitter hickory, bitter pignut, swamp
hickory, Carya cordiformis]