Măs'se-ter, n.

n. [Gr. μασσητήρ, μαστήρ, a chewer, μῦς μασητήρ, a muscle of the lower jaw, used in chewing, from μασᾶσθαι, μασᾶσθαι, to chew; N. Lat. & Fr. masseter.] (Anat.) A muscle which raises the under jaw, and assists in chewing.