Definition of photochemical adjective from the Oxford Advanced Learner's Dictionary

 

photochemical

 adjective
adjective
BrE BrE//ˌfəʊtəʊˈkemɪkl//
 
; NAmE NAmE//ˌfoʊtoʊˈkemɪkl//
 
(chemistry)
 
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caused by or relating to the chemical action of light photochemical smog
See the Oxford Advanced American Dictionary entry: photochemical