'yam bean' definitions:

noun

Twining plant of Amazon basin having large edible roots [syn: 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 [syn: yam bean, Pachyrhizus erosus]