/ Dictionary / Index L L-radiation: Meaning and Definition of Find definitions for: L-ra•di•a•tion Pronunciation: (el'rā"dē-ā"shun), [key] — n. Physics. See under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. LR LRAM 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