fibrinolysisPronunciation: /ˌfʌɪbrɪˈnɒlɪsɪs, ˌfɪb-/Definition of fibrinolysis noun [mass noun] Physiology the enzymatic breakdown of the fibrin in blood clots. Derivatives fibrinolytic adjective fibrinolysis in other Oxford dictionaries Definition of fibrinolysis in the US English dictionary