/ Dictionary / Index L lighttight: Meaning and Definition of Find definitions for: light•tight Pronunciation: (līt'tīt"), [key] — adj. Chiefly Brit. lightproof. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. light therapy light valve Related Content Daily Word Quiz: jaundice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language