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Rex
Rexburg
Rexine
Reye’s syndrome
Reykjavik
Reynold’s number
RF
Rf (1)
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Rh negative
Rh neg·a·tive [ r aych néggətiv ]


adjective 
Definition:
 
without Rh factor: lacking the Rh factor in the blood.
See also  Rh factorRh positive
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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