Meaning of photoreactivation

pho•to•re•ac•ti•va•tion

Pronunciation: (fō"tō-rē-ak"tu-vā'shun), [key]
— n. Biochem.
  1. a process that repairs DNA damaged by ultraviolet light using an enzyme that requires visible light.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.