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photodecomposition

[foh-toh-dee-kom-puh-zish-uh n] /ˌfoʊ toʊˌdi kɒm pəˈzɪʃ ən/
noun, Chemistry
1.
the breaking down of molecules by radiant energy.
Origin
1885-1890
1885-90; photo- + decomposition
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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