n. 颚, 上颚, 嘴的上(或下)部

[医] 下颌骨

[ noun ]
the jaw in vertebrates that is hinged to open the mouth
<noun.body>

Mandible \Man"di*ble\, n. [L. mandibula, mandibulum, fr. mandere
to chew. Cf. {Manger}.]
1. (Anat.) The bone, or principal bone, of the lower jaw; the
inferior maxilla; -- also applied to either the upper or
the lower jaw in the beak of birds.

2. (Zo["o]l.) The anterior pair of mouth organs of insects,
crustaceaus, and related animals, whether adapted for
biting or not. See Illust. of {Diptera}.