/ Dictionary / Index L lights: Meaning and Definition of Find definitions for: lights Pronunciation: (līts), [key] — n.pl. the lungs, esp. of sheep, pigs, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lights (Thesaurus) light-rail lightship Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language