/ Dictionary / Index L lantern jaw: Meaning and Definition of Find definitions for: lan'tern jaw" Pronunciation: [key] a distinctly protruding, often wide lower jaw. a long, thin jaw. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lantern gear lantern-jawed 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