bitternut : Idioms & Phrases
bitternut hickory
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noun hickory of the eastern United States having a leaves with 7 or 9 leaflets and thin-shelled very bitter nuts
bitternut; Carya cordiformis; bitter hickory; bitter pignut; swamp hickory.
WordNet
water bitternut
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noun hickory of southern United States having many narrow leaflets and rather bitter nuts
Carya aquatica; water hickory; bitter pecan.