/ Dictionary / Index P photodissociation: Meaning and Definition of Find definitions for: pho•to•dis•so•ci•a•tion Pronunciation: (fō"tō-di-sō"sē-ā'shun, -shē-), [key] — n. the dissociation or breakdown of a chemical compound by radiant energy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. photodisintegration photodrama Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language