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photomultiplier
photon
photonegative
photonics
photonuclear
photoperiod
photoperiodism
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photolysis
pho·tol·y·sis [ fō tólləssiss ]


noun 
Definition:
 
light-stimulated chemical decomposition: the irreversible decomposition of a chemical compound as a result of the absorption of electromagnetic radiation, especially visible light

pho·to·lyt·ic [ ftə líttik ] adjective
pho·to·lyt·i·cal·ly [ ftə líttik'lee ] adverb
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