/ Dictionary / Index K killifish: Meaning and Definition of Find definitions for: kil•li•fish Pronunciation: (kil'ē-fish"), [key] — pl. -fish, -fish•es. any of several small, oviparous cyprinodont fishes, esp. of the genus Fundulus, found in salt, brackish, and fresh waters. any of several livebearers. Cf. least killifish. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: killifish (Thesaurus) Killiecrankie killing Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language