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What is "yam bean"

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yam bean

  1. n. twining plant of Amazon basin having large edible roots [syn: potato bean, Pachyrhizus 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 oils [syn: Pachyrhizus erosus]