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

synonym: Willem de Sitter.

An organism (person or animal) that sits.

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

synonyms: baby-sitter, babysitter.

Dutch: babysit, babysitter, kinderzitje
Polish: baby-sitter, babysitterka

A person who poses for a painter or sculptor.

synonym: artist's model.

A domestic hen ready to brood.

synonyms: brood hen, broody, broody hen, setting hen.

Polish: nasiadka