Hypertext Webster Gateway: "photochemical"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Photochemical \Pho`to*chem"ic*al\, a. [Photo- + chemical.]
(Chem.)
Of or pertaining to chemical action of light, or produced by
it; as, the photochemical changes of the visual purple of the
retina.
From WordNet (r) 1.7 (wn)
photochemical
adj : of or relating to or produced by the effects of light on
chemical systems
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