RH
\ˌɑːɹˈe͡ɪt͡ʃ], \ˌɑːɹˈeɪtʃ], \ˌɑː_ɹ_ˈeɪ_tʃ]\
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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
By Princeton University
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