/ Dictionary / Index L lionfish: Meaning and Definition of Find definitions for: li•on•fish Pronunciation: (lī'un-fish"), [key] — pl. -fish•es, -fish. a brightly striped scorpionfish of the genus Pterois, esp. P. volitans, of the Indo-Pacific region, having long, flamboyant, venomous spiny fins. an Atlantic scorpionfish, Scorpaena grandicornis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lionfish (Thesaurus) lionet lionheart 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