genus Mesembryanthemum ge·nus·me·sembryanthemum uncommon noun 1. South African annual or biennial plants having flowers that open only in bright sunlight SynonymsMesembryanthemumgenus Mesembryanthemum Related words Broader terms caryophylloid dicot genus Parts Aizoaceae Part of fig marigold WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
