photocoagulationPronunciation: /ˌfəʊtə(ʊ)kəʊˌagjʊˈleɪʃ(ə)n/Definition of photocoagulation noun [mass noun] Medicine the use of a laser beam or other intense light source to coagulate and destroy or fuse small areas of tissue, especially in the retina. photocoagulation in other Oxford dictionaries Definition of photocoagulation in the US English dictionary