/ Dictionary / Index P photophosphorylation: Meaning and Definition of Find definitions for: pho•to•phos•pho•ryl•a•tion Pronunciation: (fō"tu-fos"fur-u-lā'shun), [key] — n. Biochem. phosphorylation that utilizes light as a source of energy, as in the formation of ATP from ADP and phosphorus during photosynthesis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. photophore photopia Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language