Meaning of photoisomerization

pho•to•i•som•er•i•za•tion

Pronunciation: (fō"tō-ī-som"ur-u-zā'shun), [key]
— n. Chem.
  1. isomerization induced by light.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.