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[foh-tol-uh-sis] /foʊˈtɒl ə sɪs/

the chemical decomposition of materials under the influence of light.
chemical decomposition caused by light or other electromagnetic radiation Compare radiolysis

photolysis pho·tol·y·sis (fō-tŏl’ĭ-sĭs)
Chemical decomposition induced by light or other radiant energy.
pho’to·lyt’ic (fō’tə-lĭt’ĭk) adj.
Chemical decomposition induced by light or other radiant energy. Photolysis plays an important role in photosynthesis, during which it produces energy by splitting water molecules into gaseous oxygen and hydrogen ions.


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  • Photom.

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  • Photomacrograph

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    noun a passion or desire for light; an organism’s growth toward light Word Origin photo- ‘light’

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