genus Sisyrinchium ge·nus·si·syrinchium uncommon noun 1. chiefly North American grasslike herbs SynonymsSisyrinchiumgenus Sisyrinchium Related words Broader terms liliid monocot genus Parts Iridaceae Part of blue-eyed grass WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.