1. 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 anaemia
   "The blood test determined her Rh factor status";
   - rhesus factor, Rh factor
    
2. A white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum
   - rhodium, atomic number 45

1. A substance produced by the hypothalamus that is capable of accelerating the secretion of a given hormone by the anterior pituitary gland
   - releasing factor, releasing hormone, RF, hypothalamic releasing hormone, hypothalamic releasing factor

Type of: antigen, endocrine, factor, hormone, internal secretion, metal, metallic element

Encyclopedia: Rh