1. (

• rhesus_factor ,
• Rh_factor ,
• Rh ,

) 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 ;

2. (

• rhodium ,
• Rh ,
• atomic_number_ ,

) a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum ;

3. (

• releasing_hormone ,
• RH ,
• releasing_factor ,
• hypothalamic_releasing_hormone ,
• hypothalamic_releasing_factor

) 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 ;