a system of antigens found on human red blood cells, together with the corresponding antibodies of these antigens: inherited antigens determine major blood types (A, B, AB, O), which help determine compatibility for blood transfusions
"ABO system." YourDictionary, n.d. Web. 12 October 2018. <http://www.yourdictionary.com/abo-system>.
ABO system. (n.d.). Retrieved October 12th, 2018, from http://www.yourdictionary.com/abo-system
A classification system for human blood that identifies four major blood types based on the presence or absence of two antigens, A and B, on red blood cells. The four blood types (A, B, AB, and O, in which O designates blood that lacks both antigens) are important in determining the compatibility of blood for transfusion.