Aporocactus apo·ro·cac·tus uncommon noun 1. small genus of epiphytic cacti of Mexico Synonymsgenus Aporocactus Related words Word family Aporocactus flagelliformis Broader terms caryophylloid dicot genus Parts Cactaceae Part of rattail cactus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.