n.
1.Dutch astronomer who calculated the size of the universe and suggested that it is expanding (1872-1934)
2.an organism (person or animal) that sits
3.a person engaged to care for children when the parents are not home
4.a person who poses for a painter or sculptor
5.a domestic hen ready to brood
Idiom of the Day
live in an ivory tower
to be unaware of the realities of everyday life
The university professor lives in an ivory tower and does not seem to understand what is going on in the world.