photoisomerism
/ˌfəʊtəʊʌɪˈsɒmərɪz(ə)m/Chemistry
noun
The property of a compound of having two or more forms which can be converted from one to another by the action of light; this phenomenon.
Origin
1940s; earliest use found in Proceedings of the Royal Society of London. From photo- + isomerism.
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