The Collaborative International Dictionary of English v.0.48:

hemolysis \hemolysis\ n.
   The lysis of erythrocytes with the release of hemoglobin; the
   breaking apart of red blood cells in the blood.

   Syn: haemolysis, hematolysis, haematolysis.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

hemolysis
    n 1: lysis of erythrocytes with the release of hemoglobin [syn:
         hemolysis, haemolysis, hematolysis, haematolysis]