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}, {Rh}]
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}, {Rh}, {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 of
these hormones causes the anterior pituitary to secrete a
specific hormone [syn: {releasing hormone}, {RH}, {releasing
factor}, {hypothalamic releasing hormone}, {hypothalamic
releasing factor}]