rh meaning and definition

RH noun

Definition of 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
   • synonyms: Rh factor, rhesus 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
   • synonyms: atomic number 45, rhodium
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
   • synonyms: hypothalamic releasing factor, hypothalamic releasing hormone, releasing factor, releasing hormone