photochemical

from WordNet (r) 3.0 (2006)

photochemical
    adj 1: of or relating to or produced by the effects of light on
           chemical systems

from The Collaborative International Dictionary of English v.0.48

Photochemical \Pho`to*chem"ic*al\, a. [Photo- + chemical.]
   (Chem.)
   Of or pertaining to chemical changes produced by light; as,
   the photochemical changes of the visual purple of the retina.
   [1913 Webster]