Cassia tora cas·sia·tora uncommon noun 1. cosmopolitan tropical herb or subshrub with yellow flowers and slender curved pods; a weed; sometimes placed in genus Cassia SynonymssicklepodSenna obtusifoliaCassia tora Related words Broader terms subshrub Parts genus Senna WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.