fibrinolysis Syllabification: (fi·bri·nol·y·sis)Pronunciation: /ˌfībrəˈnäləsis/Definition of fibrinolysis noun Physiology the enzymatic breakdown of the fibrin in blood clots. Derivatives fibrinolyticPronunciation: /ˈfībrənəˈlitik/ adjective fibrinolysis in other Oxford dictionaries Definition of fibrinolysis in the British & World English dictionary