WordNet (r) 3.0 (2006):

sieva bean
    n 1: bush bean plant cultivated especially in southern United
         States having small flat edible seeds [syn: sieva bean,
         butter bean, butter-bean plant, lima bean, Phaseolus
         lunatus]
    2: small flat green bean similar to lima beans [syn: sieva
       bean, butter bean, butterbean, civet bean]