Rh

noun

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

   noun.substance

   Synonyms rh factor rhesus factor

   Source: WordNet 3.0

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

   noun.substance

   Synonyms atomic number 45 rhodium

   Source: WordNet 3.0

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

   noun.body

   Synonyms hypothalamic releasing factor hypothalamic releasing hormone releasing factor releasing hormone

   Source: WordNet 3.0