1. reaction of the body to a transfusion of blood that is not compatible with its own blood; an adverse reaction can range from fever and hives to renal failure and shock and death;
WordNet (r) 3.0 (2006):
transfusion reaction
n 1: reaction of the body to a transfusion of blood that is not
compatible with its own blood; an adverse reaction can
range from fever and hives to renal failure and shock and
death