photocatalysis

noun
pho·to·ca·tal·y·sis | \ˌfōt-ō-kə-ˈtal-ə-səs \
plural photocatalyses\-ˌsēz \

Medical Definition of photocatalysis 

: the acceleration of a chemical reaction by radiant energy (as light) acting either directly or by exciting a substance that in turn catalyzes the main reaction — compare photoinactivation sense 1

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