Relating to or a reference to the jaw and/or the cheeks.

A measure of the projection of the upper jaw, expressed by multiplying the distance from basion to the aleolar point (middle point of the anterior surface of the upper jaw) by 100 and dividing it by the distance from basion (middle of the anterior or the front margin of the great foramen or the small opening of the skull) to nasion (the point where the bridge of the nose meets the forehead).