photoreaction

noun
pho·to·re·ac·tion | \ ˌfō-tō-rē-ˈak-shən \

Definition of photoreaction 

: a photochemical reaction

First Known Use of photoreaction

1909, in the meaning defined above

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The first known use of photoreaction was in 1909

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photoreaction

noun
pho·to·re·ac·tion | \ -rē-ˈak-shən \

Medical Definition of photoreaction 

: a photochemical reaction

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