Meaning of photodecomposition

pho•to•de•com•po•si•tion

Pronunciation: (fō"tō-dē"kom-pu-zish'un), [key]
— n. Chem.
  1. the breaking down of molecules by radiant energy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.