bryony(n = noun.plant)briony - a vine of the genus Bryonia having large leaves and small flowers and yielding acrid juice with emetic and purgative properties;
The common name of several cucurbitaceous plants of the genus Bryonia. The root of Bryonia alba (rough bryony or white bryony) and of Bryonia dioica is a strong, irritating cathartic. [1913 Webster]
Black bryony, a plant (Tamus communis) so named from its dark glossy leaves and black root; black bindweed.