genus Chamaemelum ge·nusc·ha·maemelum uncommon noun 1. small genus of plants sometimes included in genus Anthemis: chamomile SynonymsChamaemelumgenus Chamaemelum Related words Broader terms asterid dicot genus Parts Compositae Part of chamomile WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.