photoinactivation
noun
pho·to·in·ac·ti·va·tion
ˌfōt-ō-(ˌ)in-ˌak-tə-ˈvā-shən
1
: the retardation or prevention of a chemical reaction by radiant energy (as light) compare photocatalysis
2
: the inactivation of a substance by radiant energy (as light) compare photoactivation
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Merriam-Webster unabridged
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