genus Scleranthus ge·nussc·le·ranthus uncommon noun 1. small genus of Old World weedy prostrate annuals: knawel SynonymsScleranthusgenus Scleranthus Related words Broader terms caryophylloid dicot genus Parts Caryophyllaceae Part of knawel WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.