n.
1.a blood group antigen possessed by Rh-positive people
2.a white hard metallic element that is one of the platinum group and is found in platinum ores
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
Idiom of the Day
knock (someone) off his or her feet
to surprise or shock someone so much that he does not know what to do
When they announced that I had won the prize it knocked me off my feet.