1911 Encyclopædia Britannica/Jaw

JAW (Mid. Eng. jawe, jowe and geowe, O. Eng. cheowan, connected with “chaw” and “chew,” and in form with “jowl”), in anatomy, the term for the upper maxillary bone, and the mandible or lower maxillary bone of the skull; it is sometimes loosely applied to all the lower front parts of the skull (q.v.).