noun Anatomy.
a thin, flat muscle lining the cheek, the action of which contracts and compresses the cheek.

1665–75; < Neo-Latin; Latin buccinātor, būcinātor trumpeter, equivalent to būcinā(re) to signal on a trumpet (verbal derivative of būcina curved trumpet or horn) + -tor -tor

buccinatory [buhk-suh-nuh-tawr-ee, -tohr-ee, buhk-suh-ney-tuh-ree] , adjective
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World English Dictionary
buccinator (ˈbʌksɪˌneɪtə)
a thin muscle that compresses the cheeks and holds them against the teeth during chewing, etc
[C17: from Latin, from buccināre to sound the trumpet, from buccina trumpet]

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