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Medical Definition of Immune haemolysin
1. A sensitizing, complement-fixing, haemolytic antibody formed in an animal as the result of parenteral administration of red blood cells or whole blood from another species; immune haemolysin may also be formed in human beings who are transfused with human blood that is antigenic in the recipient, e.g., the formation of anti-Rh antibody in an Rh-negative person who is treated with Rh-positive red blood cells. (05 Mar 2000)