groundnut

noun

1. 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.
2. any of several other plants having edible underground parts, as the peanut.
3. South Atlantic States. peanut.

noun

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. British another name for peanut