yam bean

(noun) twining plant of Amazon basin having large edible roots. Synonyms: yam bean, potato bean, Pachyrhizus tuberosus.

(noun) Central American twining plant with edible roots and pods; large tubers are eaten raw or cooked especially when young and young pods must be thoroughly cooked; pods and seeds also yield rotenone and oils. Synonyms: yam bean, Pachyrhizus erosus.