/ Thesaurus / R Synonyms of rattail cactus Find synonyms for: Noun1. rattail cactus, rat's-tail cactus, Aporocactus flagelliformis, cactususage: commonly cultivated tropical American cactus having slender creeping stems and very large showy crimson flowers that bloom for several daysWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: penurious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language