Wiktionary
n. 1 (context of an animal English) The oral cavity, bound by the cheeks of the face, the palate, and the flesh of the mandible, opening onto the mouth and the fauces, and containing the tooth, tongue, gums, and other structures. 2 (context of an insect English) The first part of the stomodaeum, lying just within the mouth; its dilator muscles arising on the clypeus, and inserted before the frontal ganglion and its connectives.
WordNet
n. the cavity between the jaws and the cheeks
Usage examples of "buccal cavity".
He looked up from his current patientan Otolla Gungan observer from Naboo, who had had his buccal cavity severely varicosed by a sonic pistol blast the day before.
It is pronounced by forcing the breath from the back of the throat with the mouth wide open, through the buccal cavity with the lips so shaped as to modify the sound from A to O (or U), to the closed lips, when it becomes M.
The deep recesses around the mouth and nose, the hollowed cheeks that encroached so deeply over the broad jaw that they seemed to leave no space for the buccal cavity within, filled for a moment as if a single breath of life had passed momentarily through the body.
THE ULTIMAX MAN 209 end, an astonishingly wide mouth opened on large, squarish, lemon yellow teeth and a bright pink buccal cavity where a grayish tongue lolled.