mandible mandible /ˈmændɪbəl/

noun

1. The jaw in vertebrates that is hinged to open the mouth  ( jawbone , lower jawbone , mandible , mandibula , mandibular bone , submaxilla , lower jaw , jowl )
   the jaw in vertebrates that is hinged to open the mouth
    As the dog grew older, its jowl sagged more prominently.
   As the dog grew older, its jowl sagged more prominently.