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either the mandible (lower jaw) or the maxilla (upper jaw), two opposing bony structures of the mouth of a vertebrate; they bear the teeth and are used for seizing prey, for biting, or for masticating food. See anatomic Table of Bones in the Appendices.
cleft jaw a cleft between the median nasal and maxillary processes through the alveolus; see also cleft palate. Called also gnathoschisis.
phossy jaw phosphonecrosis.
prognathism and pouting lower lip, characteristic of the Hispano-Austrian imperial dynasty.
a lower jaw (mandible) that projects forward in advance of the upper jaw (maxilla), resulting in a skeletal Class III malocclusion according to Angle's classification of malocclusion. The term relates to the Hapsburg royal family in which that facial pattern was dominant.