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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

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

From: WordNet (r) 2.0

 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]