'Photochemistry' definitions:

Definition of 'photochemistry'

(from WordNet)
noun
Branch of chemistry that deals with the chemical action of light

Definition of 'Photochemistry'

From: GCIDE
  • Photochemistry \Pho`to*chem"is*try\, n. [Photo- + chemistry.] (Chem.) The branch of chemistry which relates to the effect of light in producing chemical changes, as in photography. [1913 Webster] Photochromic