Rh Rh /ɑːrˈeɪtʃ/

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  ( Rh factor , rhesus factor , Rh )
   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
   

 RH

1. 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  ( hypothalamic releasing factor , hypothalamic releasing hormone , releasing factor , releasing hormone , RH )
   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
   

 Rh

1. A white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum  ( atomic number 45 , Rh , rhodium )
   a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum