Dutch astronomer who calculated the size of the universe and suggested that it is expanding (1872-1934)
"The lecture featured Edwin Hubble, a sitter whose groundbreaking calculations proved that the universe is indeed expanding."
an organism (person or animal) that sits
"The cat curled up on my lap to act as a warm sitter for my cold feet."
a person engaged to care for children when the parents are not home
"When my husband went into work early, he asked his sister if she could be our Saturday sitter while we attended the morning meeting."
a person who poses for a painter or sculptor
"The artist spent three hours sketching his new sitter to capture the perfect angle of her jawline."
a domestic hen ready to brood
"The old farmer waited anxiously for his new pullet to become a sitter so she could start hatching eggs."
Someone who sits, e.g. for a portrait.
"The model posed patiently as an extra sitter in the photographer's queue while waiting for her turn."
A surname.
"The local historical society is hosting a talk next Tuesday by John Sitter about his great-grandfather's life in the 1920s."