Rh factor

noun

\ ˌär-ˈāch-

Definition of Rh factor

: any of one or more genetically determined antigens present in the red blood cells of most persons and of higher animals and capable of inducing intense immunogenic reactions

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The first known use of Rh factor was in 1942

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Rh factor

noun

English Language Learners Definition of Rh factor

medical : a substance that is present in the red blood cells of most people

See the full definition for Rh factor in the English Language Learners Dictionary

Rh factor

noun

\ ˈär-ˈāch-

Medical Definition of Rh factor

: a genetically determined protein on the red blood cells of some people that is one of the substances used to classify human blood as to compatibility for transfusion and that when present in a fetus but not in the mother causes a serious immunogenic reaction in which the mother produces antibodies that cross the placenta and attack the red blood cells of the fetus

— called also rhesus factor