Also called wild bean, potato bean. a twining, North American plant, Apios americana (or A. tuberosa ), of the legume family, having clusters of fragrant brownish flowers and an edible tuber.
any of several other plants having edible underground parts, as the peanut.
South Atlantic States. peanut.

1595–1605; ground1 + nut Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
groundnut (ˈɡraʊndˌnʌt)
1.  a North American climbing leguminous plant, Apios tuberosa, with fragrant brown flowers and small edible underground tubers
2.  the tuber of this plant
3.  any of several other plants having underground nutlike parts
4.  (Brit) another name for peanut

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Similarly sunflower oil industry gets manufactured research against groundnut and coconut oils.
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