lower jawbone lower jawbone /ˈloʊər ˈdʒɔːboʊn/

noun

1. The jaw in vertebrates that is hinged to open the mouth  ( jawbone , lower jawbone , mandible , jowl , lower jaw , mandibula , mandibular bone , submaxilla )
   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.