Meaning of photodissociation

pho•to•dis•so•ci•a•tion

Pronunciation: (fō"tō-di-sō"sē-ā'shun, -shē-), [key]
— n.
  1. the dissociation or breakdown of a chemical compound by radiant energy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.