1. rhesus factor, Rh factor, Rh, antigen

usage: 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 45, metallic element, metal

usage: 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, hormone, endocrine, internal secretion

usage: 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

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See also: rh (Dictionary)