Literally meaning: “decomposition caused by light”
Origin: Anc Greek
φως/phos(=light) > (genitive φωτός/photos=of light)
+λύσις/lysis(=dissolution, degradation, decomposition) > verb λύω/leo =break down, solve, loose, degradate)
(chemistry) (Photolysis is a chemical decomposition under influence of light. For example, the photolysis of water molecule in photosynthesis caused by light.