The Rh full form is known as Rhesus. You can study how the Rhfull form came into being in any higher-level biology book. The students who are into medicine and other sections of higher biological studies also know about the full form of Rh. The Rh factor meaning is the presence of the Rh protein on the RBCs. This makes the blood either positive or negative. In most human beings, Rh-positive blood is found. On the other hand, people with Rh-negative blood should always be careful about blood loss as they might not get blood when needed.