Rh blood group system, system for classifying blood groups according to the presence or absence of the Rh antigen, often called the Rh factor, on the cell membranes of the red blood cells (erythrocytes).The designation Rh is derived from the use of the blood of rhesus monkeys in the basic test for determining the presence of the Rh antigen in human blood. There is no d antigen. Blood typing is a method to tell what type of blood you have. If you do have Rh factor in your blood, you are Rh positive. Blood typing is done so you can safely donate your blood or receive a blood transfusion. 1 A member of a people inhabiting parts of southern India and Sri Lanka. Rh positive is the most common blood type. Information and translations of rh-positive blood type in the most comprehensive dictionary definitions resource on the web. Your blood type is based on whether or not certain proteins are on your red blood cells. Having an Rh negative blood type is not an illness and usually does not affect your health. noun. Meaning of rh-positive blood type. Definition of rh-positive blood type in the Definitions.net dictionary. A baby can inherit the Rh factor from either parent. However, it can affect your pregnancy. The Rh blood group system is one of 36 known human blood group systems.It is the second most important blood group system, after the ABO blood group system.The Rh blood group system consists of 49 defined blood group antigens, among which the five antigens D, C, c, E, and e are the most important. Rhesus (Rh) typing is used to determine whether you have a specific protein called Rh factor on the outer layer of your red blood cells. What does rh-positive blood type mean? Your pregnancy needs special care if you're Rh negative and your baby is Rh positive (Rh incompatibility). If you do not have Rh factor in your blood, you are Rh negative. It is also done to see if you have a substance called Rh factor on the surface of your red blood cells. Meaning of Tamil in English: Tamil.