yam bean

Noun (2)

1. twining plant of Amazon basin having large edible rootsSynonyms: potato beanPachyrhizus tuberosus
2. 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 oilsSynonyms: Pachyrhizus erosus