/ Dictionary / Index S swordtail: Meaning and Definition of Find definitions for: sword•tail Pronunciation: (sôrd'tāl", sōrd'-), [key] — n. any of several small, brightly colored, viviparous, freshwater fishes of the genus Xiphophorus, native to Central America, having the lower part of the caudal fin elongated into a swordlike structure: often kept in aquariums. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: swordtail (Thesaurus) swordsman swore Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language