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
tilt at windmills
to fight battles with imaginary or unimportant enemies or issues
My friend is tilting at windmills by fighting his company for no good reason.