WordNet (r) 3.0 (2006):

Bengal bean
    n 1: the annual woody vine of Asia having long clusters of
         purplish flowers and densely hairy pods; cultivated in
         southern United States for green manure and grazing [syn:
         cowage, velvet bean, Bengal bean, Benghal bean,
         Florida bean, Mucuna pruriens utilis, Mucuna
         deeringiana, Mucuna aterrima, Stizolobium deeringiana]