/ Dictionary / Index P photoreduction: Meaning and Definition of Find definitions for: pho•to•re•duc•tion Pronunciation: (fō"tō-ri-duk'shun), [key] — n. Chem. a reduction reaction induced by light. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. photorecording photoresist Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language