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Rhesus factor 
 noun 1.A blood group antigen possessed by Rh-positive people; if an Rh-negative person receives a blood transfusion from an Rh-positive person it can result in hemolysis and anemia.  Synonyms: Rh, Rh factor.  
 
 
 
  
 WordNet 3.0 © 2010 Princeton University 
 
  
 
 
  
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