WordNet (r) 3.0 (2006):

Rh factor
    n 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
         [syn: rhesus factor, Rh factor, Rh]

Moby Thesaurus II by Grady Ward, 1.0:

63 Moby Thesaurus words for "Rh factor":
   Rh-negative, Rh-positive, Rh-type, Rhesus factor, agglutinin,
   allergen, anaphylactin, antiantibody, antibody, antigen, antiserum,
   antitoxic serum, antitoxin, antivenin, arterial blood, blood,
   blood bank, blood cell, blood count, blood donor,
   blood donor center, blood group, blood grouping, blood picture,
   blood platelet, blood pressure, blood serum, blood substitute,
   bloodmobile, bloodstream, circulation, clinical dextran, dextran,
   erythrocyte, globulin, gore, grume, hematics, hematologist,
   hematology, hematoscope, hematoscopy, hemocyte, hemoglobin,
   hemometer, humor, ichor, incomplete antibody, interferon,
   isoantibody, leukocyte, lifeblood, neutrophil, opsonin, phagocyte,
   plasma, plasma substitute, precipitin, red corpuscle, serum,
   type O, venous blood, white corpuscle