/ Dictionary / Index P photoaging: Meaning and Definition of Find definitions for: pho•to•ag•ing Pronunciation: (fō"tō-ā'jing), [key] damage to the skin, as wrinkles or discoloration, caused by prolonged exposure to sunlight. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. photoactivation photoallergic Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language