plasmin

from WordNet (r) 3.0 (2006)

plasmin
    n 1: an enzyme that dissolves the fibrin of blood clots [syn:
         {plasmin}, {fibrinolysin}]

from 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]