Pig-nut

pignut

[pig-nuht]
noun
1.
the nut of the brown hickory, Carya glabra, of North America.
2.
the tree itself.
3.
the tuber of a European plant, Conopodium denudatum.

Origin:
1600–10; pig1 + nut

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World English Dictionary
pignut (ˈpɪɡˌnʌt)
 
n
1.  Also called: hognut
 a.  the bitter nut of any of several North American hickory trees, esp Carya glabra (brown hickory)
 b.  any of the trees bearing such a nut
2.  another name for earthnut

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