/ Dictionary / Index R radioluminescence: Meaning and Definition of Find definitions for: ra•di•o•lu•mi•nes•cence Pronunciation: (rā"dē-ō-l"mu-nes'uns), [key] — n. Physics. luminescence induced by nuclear radiation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radiolucent radiolysis Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language