Mandible

n. lower jaw bone; lower part of a bird's bill; either of a pair of jawlike biting organs in insects

The mandible (from Latin mandibūla, "jawbone") or inferior maxillary bone is, together with the maxilla, the largest and strongest bone of the face . It forms the lower jaw and holds the lower teeth in place.
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Mandible /man·di·ble/ the horseshoe-shaped bone forming the lower jaw, articulating with the skull at the temporomandibular joint. [more]Mandible - Community and Resources

Noun
1. the lower jawbone in vertebrates; it is hinged to open the mouth
(synonym) lower jaw, mandibula, mandibular bone, submaxilla, lower jawbone, jawbone, jowl
(hypernym) jaw
(hyponym) lantern jaw
(part-meronym) gnathion

(n.)
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.
  

(n.)
The anterior pair of mouth organs of insects, crustaceaus, and related animals, whether adapted for biting or not. See Illust. of Diptera.