photodissociation
noun
pho·to·dis·so·ci·a·tion ˌfō-tō-di-ˌsō-sē-ˈā-shən 
-shē-
: dissociation of the molecules of a substance (such as water) caused by absorption of radiant energy
photodissociate
ˌfō-tō-di-ˈsō-sē-ˌāt
verb -shē-
Word History
First Known Use
1907, in the meaning defined above
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