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1. Any of several hormones produced in the hypothalamus and carried by a vein to the anterior pituitary gland where they stimulate the release of anterior pituitary hormones; each of these hormones causes the anterior pituitary to secrete a specific hormone
   - releasing hormone, releasing factor, hypothalamic releasing hormone, hypothalamic releasing factor

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
   - 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

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

Encyclopedia: RH