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.

Source: Webster's Revised Unabridged Dictionary (1913)