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
swear on (something)
to use something as the reason or authority that what you are saying is the truth
The accused criminal was asked to swear on a religious text at the trial to make sure that he was telling the truth.