/ Dictionary / Index L luminous: Meaning and Definition of Find definitions for: lu•mi•nous Pronunciation: (l'mu-nus), [key] — adj. radiating or reflecting light; shining; bright. lighted up or illuminated; well-lighted: the luminous ballroom. brilliant intellectually; enlightened or enlightening, as a writer or a writer's works: a luminous concept; luminous prose. clear; readily intelligible: a concise, luminous report. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: luminous (Thesaurus) luminosity class luminous emittance Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language