[foh-toh-kem-uh-stree] /ˌfoʊ toʊˈkɛm ə stri/

the branch of that deals with the chemical action of light.
the branch of chemistry concerned with the chemical effects of light and other electromagnetic radiations Also called actinochemistry

photochemistry pho·to·chem·is·try (fō’tō-kěm’ĭ-strē)
The branch of chemistry that deals with the effects of light on chemical systems.
pho’to·chem’i·cal (-ĭ-kəl) adj.
The scientific study of the effects of light and ultraviolet radiation on chemical reactions.


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