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Medical Dictionary

jaw

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noun \ˈjȯ\

Medical Definition of jaw

  1. 1:  either of two complex cartilaginous or bony structures in most vertebrates that border the mouth, support the soft parts enclosing it, and usually bear teeth on their oral margin:a:  an upper structure more or less firmly fused with the skull—called also upper jaw, maxillab:  a lower structure that consists of a single bone or of completely fused bones and that is hinged, movable, and articulated by a pair of condyles with the temporal bone of either side—called also inferior maxillary bone, lower jaw, mandible

  2. 2:  the parts constituting the walls of the mouth and serving to open and close it—usually used in plural

  3. 3:  any of various organs of invertebrates that perform the function of the vertebrate jaws





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