/ Dictionary / Index P photogelatin process: Meaning and Definition of Find definitions for: photogel'atin proc"ess Pronunciation: [key] collotype (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. photogelatin photogen Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language