WordNet (r) 3.0 (2006):

Amphicarpaea bracteata
    n 1: vine widely distributed in eastern North America producing
         racemes of purple to maroon flowers and abundant (usually
         subterranean) edible one-seeded pods resembling peanuts
         [syn: hog peanut, wild peanut, Amphicarpaea
         bracteata, Amphicarpa bracteata]