| plasminogen activator | (n) protease produced in the kidney that converts plasminogen to plasmin and so initiates fibrinolysis, Syn. urokinase |
| tissue plasminogen activator | (n) a thrombolytic agent (trade name Activase) that causes fibrinolysis at the site of a blood clot; used in treating acute myocardial infarction, Syn. Activase |