rh Meaning, Definition & Usage

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
   Rh factor; rhesus factor.
   
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
   atomic number 45; rhodium.
   
3. noun 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 factor; hypothalamic releasing hormone; hypothalamic releasing factor; releasing hormone.
   

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