/ Dictionary / Index P photopositive: Meaning and Definition of Find definitions for: pho•to•pos•i•tive Pronunciation: (fō"tu-poz'i-tiv), [key] — adj. Physics. pertaining to a substance whose conductivity increases upon absorption of electromagnetic radiation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. photopolymerization photoprint Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language