Definition of "groundnut" in English

noun

1. A climbing vine, Apios americana, of eastern North America, having fragrant brownish flowers and small edible tubers.

2. Any similar plant having underground tubers.

3. The nutlike tuber of such a plant, especially peanuts.

4. A plant which bears its nutlike seeds underground, such as a peanut (Arachis hypogaea) or a Bambara groundnut (Vigna subterranea).