buccal
/ˈbʌkəl/adjective
1- technical of or relating to the cheek〈技〉（与）面颊（有关）的：
the buccal side of the molars.
臼齿的颊面。
1.1
- of or relating to the mouth（与）口（有关）的：
the buccal cavity.
口腔。
词源
early 19th cent.: from Latin bucca 'cheek' + -AL.