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[From its having first been detected in the blood of the rhesus monkey.]
(Biochemistry) See Rh factor
any of a group of antigens on the surface of red blood cells, those having inherited such antigens being designated Rh + (Rh positive) and those lacking them, a much smaller group, being designated Rh− (Rh negative) : transfused or fetal Rh + blood may induce a severe reaction in an Rh− individual.
[1940–45; so called because first found in the blood of rhesus monkeys]
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|Noun||1.||rhesus factor - 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|
antigen - any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)