Dutch astronomer who calculated the size of the universe and suggested that it is expanding (1872-1934)

[ Syn: sitter , willem de sitter ]

an organism (person or animal) that sits

a person engaged to care for children when the parents are not home

[ Syn: babysitter , baby-sitter ]

a person who poses for a painter or sculptor

[ Syn: artists model ]

a domestic hen ready to brood

[ Syn: brood hen , broody , broody hen , setting hen ]