genus Ranunculus ge·nus·ra·nunculus uncommon noun 1. annual, biennial or perennial herbs: buttercup; crowfoot SynonymsRanunculusgenus Ranunculus Related words Broader terms magnoliid dicot genus Parts Ranunculaceae Part of buttercupwater crowfootlesser celandinelesser spearwortsagebrush buttercupgreater spearwort WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.