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photochemical

adjective
 
 
/ˌfəʊ.təʊˈkem.ɪ.kəl/ US  /ˌfoʊ.t̬oʊ-/ specialized

Definition

relating to the effect of light on some chemicalsPhysical and chemical processes
(Definition of photochemical adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of photochemical