/ Dictionary / Index R rat-tail cactus: Meaning and Definition of Find definitions for: rat'-tail cac"tus Pronunciation: [key] a cactus, Aporocactus flagelliformis, of Mexico, having slim, cylindrical stems that are easily trained into strange designs, and crimson flowers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rat-tail rattail comb Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language