/ Dictionary / Index R rat-tail: Meaning and Definition of Find definitions for: rat-tail Pronunciation: (rat'tāl"), [key] — n. grenadier (def. 4). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rat-tail (Thesaurus) rat's nest rat-tail cactus 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