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photochemical reaction [photochemical reactions]▼(chemical reaction)noun[UK: ˌfəʊ.təʊˈk.e.mɪk.l̩ rɪ.ˈæk.ʃn̩] [US: ˌfoʊto.ʊˈk.e.mɪk.l̩ ri.ˈæk.ʃn̩]
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