Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Rh factor.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun An antigen (also referred to as RhD) appearing on the surface of the red blood cells of most (85%) humans. An incompatibility between the Rh-blood types of a mother and her baby may cause serious disease for the baby.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun 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

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From its having first been detected in the blood of the rhesus monkey.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

The antigen was discovered in connection with a research of rhesus monkeys.

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