Rh

/ˈɑr ˌeɪtʃ/

Definitions of Rh

1. noun

   a blood group antigen possessed by Rh-positive people; if an Rh-negative person receives a blood transfusion from an Rh-positive person it can result in hemolysis and anemia
   synonyms: Rh factor, rhesus factor

   type of:

   antigen

   any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)
2. noun

   a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum
   synonyms: atomic number 45, rhodium

   type of:

   metal, metallic element

   any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.