Rh antibody, also referred to as Rhesus factor antibody or anti-D antibody, is an immunoglobulin produced by the Rh-negative individual due to exposure to Rh-positive blood cells. Incompatibility in the Rh factor between mother and fetus may lead to the production of Rh antibodies, causing hemolytic disease, also known as erythroblastosis fetalis. Several synonyms for Rh antibody include Anti-D, RhIg, anti-Rh, Rhogam, WinRho, and RhoGAM Ultra-Filtered PLUS. These synonyms are used interchangeably in contexts related to blood transfusion, pregnancy, and medical research. Understanding the different synonyms for Rh antibody can help medical professionals and researchers communicate effectively and avoid confusion in clinical settings.