/ Dictionary / Index L lanternfish: Meaning and Definition of Find definitions for: lan•tern•fish Pronunciation: (lan'turn-fish"), [key] — pl. -fish, -fish•es. any of several small, deep-sea fishes of the family Myctophidae, having rows of luminous organs along each side, certain species of which migrate to the surface at night. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lanternfish (Thesaurus) lantern clock lanternfly Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language