RH FACTOR -
Noun: An antigen found in the red blood cells of most human beings and the higher mammals. Blood containing this substance is Rh positive and does not combine favorably with blood which is Rh negative and lacks this substance. The presence or absence of the Rh factor is governed by a dominant gene, which means that when Rh-positive and Rh-negative genes are paired, the resulting children are always Rh-positive.

From 'Rhesus monkey', which is a small yellowish-brown monkey with a short tail, found in India. It is often used in medical research. This blood factor was first found in the blood of the rhesus monkey.

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