Gnathic

[Sarah]

Of or pertaining to the jaw. Gnathic index, in a skull, theratio of the distance from the middle of the nasofrontal suture tothe basion (taken equal to 100), to the distance from the basion tothe middle of the front edge of the upper jaw; -- called alsoalveolar index.Skulls with the gnathic index below 98 are orthognathous, from 98 to103 mesognathous, and above 103 are prognathous. Flower.