'Masseter' definitions:

Definition of 'masseter'

From: WordNet
noun
A large muscle that raises the lower jaw and is used in chewing

Definition of 'Masseter'

From: GCIDE
  • Masseter \Mas"se*ter\, n. [NL., fr. Gr. ? a chewer, ? a muscle of the lower jaw used in chewing, from ? to chew: cf. F. mass['e]ter.] (Anat.) The large muscle which raises the under jaw, and assists in mastication. [1913 Webster]