genus Gymnocalycium ge·nus·gym·nocalycium uncommon noun 1. large genus of low-growing globular South American cacti with spiny ribs covered with many tubercles SynonymsGymnocalyciumgenus Gymnocalycium Related words Broader terms caryophylloid dicot genus Parts Cactaceae WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
