Source : WordNet®

potato bean
     n 1: twining plant of Amazon basin having large edible roots
          [syn: {yam bean}, {Pachyrhizus tuberosus}]
     2: a North American vine with fragrant blossoms and edible
        tubers; important food crop of Native Americans [syn: {groundnut},
         {groundnut vine}, {Indian potato}, {wild bean}, {Apios
        americana}, {Apios tuberosa}]
     3: nutlike tuber; important food of Native Americans [syn: {groundnut},
         {wild bean}]