Rh-type is a term used to describe an individual's blood type that is either positive or negative. However, there are various synonyms that can be used to refer to this blood type. One of the most common synonyms is Rhesus factor, which is named after the Rhesus monkey. Other synonyms include Rh antigen, D antigen, and Rh factor. These terms are used interchangeably to refer to the protein that is found on the surface of red blood cells. The presence or absence of this protein can cause certain medical complications during pregnancy, making it important for pregnant women to know their Rh type. Overall, there are several synonyms that can be used to describe an individual's Rh type, all of which describe the presence or absence of the Rh protein.