Definitions for buccinator muscle
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Princeton's WordNet
cheek muscle, buccinator muscle, musculus buccinator(noun)
a muscle that flattens the cheek and retracts the angle of the mouth
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"buccinator muscle." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/buccinator muscle>.

