GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Mandible , n. [L. mandibula, mandibulum, fr. mandere to chew. Cf. Manger.]
   (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.
   1913 Webster
   (Zool.) The anterior pair of mouth organs of insects, crustaceaus, and related animals, whether adapted for biting or not. See Illust. of Diptera.
   1913 Webster