/ Dictionary / Index P photogen: Meaning and Definition of Find definitions for: pho•to•gen Pronunciation: (fō'tu-jun, -jen"), [key] — n. a light oil obtained by the distillation of bituminous shale, coal, or peat: once commercially produced chiefly as an illuminant and as a solvent. a photogenic organ, organism, or substance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. photogelatin process photogene Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language