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

• hypothalamic releasing factor
• hypothalamic releasing hormone
• releasing factor
• releasing hormone

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

• antigen

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

• metal
• metallic element

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

• endocrine
• hormone
• internal secretion