/ Dictionary / Index L luminous flux density: Meaning and Definition of Find definitions for: lu'minous flux' den"sity Pronunciation: [key] luminous flux per unit of cross-sectional area. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. luminous flux luminous intensity 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