/ Dictionary / Index H horse tail: Meaning and Definition of Find definitions for: horse' tail" Pronunciation: [key] a ponytail. horse•tail Pronunciation: (hôrs'tāl"), [key] — n. Also calledany nonflowering plant of the genus Equisetum, having hollow, jointed stems. a horse's tail formerly used as a Turkish military standard or as an ensign of a pasha, the number of tails increasing with the rank. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: horsetail (Thesaurus) horse stinger horsetail agaric Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language