Meaning of the word "rhesus factor" in English

What does "rhesus factor" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

rhesus factor

US /ˈriː.səs ˌfæk.tɚ/
UK /ˈriː.səs ˌfæk.tər/

Noun

an antigen occurring on the red blood cells of many humans (around 85 percent) and some other primates. It is a cause of hemolytic disease of the newborn and of incompatibility in blood transfusions.

Example:
Blood tests revealed that she had a negative Rhesus factor.
Understanding your Rhesus factor is crucial during pregnancy.