Definition of earthnut

1 : any of various roots, tubers, or subterranean pods: such as
a : the tuber of a common southern European plant (Conopodium denudatum) of the family Umbelliferae having the flavor of roasted chestnuts
c : peanut
d or less commonly earthnut pea : the root of the heath pea
2 : any plant producing earthnuts
3 : truffle

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First Known Use of earthnut

14th century, in the meaning defined at sense 1

History and Etymology for earthnut

Middle English erthenote, from Old English eorthnutu, from eorth- (from eorthe earth) + nutu, hnutu nut

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The first known use of earthnut was in the 14th century

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