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What is "potato bean"

WordNet
potato bean

  1. n. 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]