"sitter" in the noun sense
1. Sitter, Willem de Sitter
Dutch astronomer who calculated the size of the universe and suggested that it is expanding (1872-1934)
an organism (person or animal) that sits
3. babysitter, baby-sitter, sitter
a person engaged to care for children when the parents are not home
4. artist's model, sitter
a person who poses for a painter or sculptor
5. brood hen, broody, broody hen, setting hen, sitter
a domestic hen ready to brood
Source: WordNet® (An amazing lexical database of English)
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