Definitions for yam bean
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Princeton's WordNet
yam bean, potato bean, Pachyrhizus tuberosus(noun)
twining plant of Amazon basin having large edible roots
yam bean, Pachyrhizus erosus(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
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