1. (noun)snailflower, snail-flower, snail flower, snail bean, corkscrew flower, Vigna caracalla, Phaseolus caracalla perennial tropical American vine cultivated for its racemes of showy yellow and purple flowers having the corolla keel coiled like a snail shell; sometimes placed in genus Phaseolus Synonyms: corkscrewflower, snail-flower, snailflower, snailflower, snailbean