buccinator
noun
buc·ci·na·tor ˈbək-sə-ˌnā-tər 
: a thin broad muscle forming the wall of the cheek
Word History
Etymology
New Latin, from Latin bucinator trumpeter, from bucinare to sound on the trumpet, from bucina trumpet, from bov-, bos cow + canere to sing, play — more at cow, chant
First Known Use
1615, in the meaning defined above
Medical Definition
buccinator
noun
buc·ci·na·tor ˈbək-sə-ˌnāt-ər
: a thin broad muscle forming the wall of the cheek and serving to compress the cheek against the teeth and to retract the angle of the mouth
called also buccinator muscle