yam bean

Noun yam bean has 2 senses

• yam bean(n = noun.plant) pachyrhizus tuberosus, potato bean - twining plant of Amazon basin having large edible roots;
is a member of genus pachyrhizus, pachyrhizus
is a kind of vine

• yam bean(n = noun.plant) pachyrhizus erosus - 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;
is a member of genus pachyrhizus, pachyrhizus
is a kind of vine