The Collaborative International Dictionary of English v.0.48:
Plasmin \Plas"min\, n. (Physiol. Chem.) A proteid body, separated by some physiologists from blood plasma. It is probably identical with fibrinogen. [1913 Webster]WordNet (r) 3.0 (2006):
plasmin n 1: an enzyme that dissolves the fibrin of blood clots [syn: plasmin, fibrinolysin]