Source : WordNet®

Rh
     n 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 anemia
          [syn: {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 [syn: {rhodium}, {atomic number 45}]
     3: 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 releasing hormone causes the anterior pituitary to
        secrete a specific hormone [syn: {releasing hormone}, {releasing
        factor}, {hypothalamic releasing hormone}, {hypothalamic
        releasing factor}]