photoisomerization

noun
pho·​to·​isom·​er·​iza·​tion
variants: also British photoisomerisation \ˌfōt-​ō-​ī-​ˌsäm-​ə-​rə-​ˈzā-​shən \

Medical Definition of photoisomerization 

: the light-initiated process of change from one isomeric form of a compound, radical, or ion to another

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