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 for Gnathic index
From The Collaborative International Dictionary of English v.0.48 :

  Gnathic \Gnath"ic\, a. [Gr. gna`qos the jaw.] (Anat.)
     Of or pertaining to the jaw.
     [1913 Webster]
     Gnathic index, in a skull, the ratio of the distance from
        the middle of the nasofrontal suture to the basion (taken
        equal to 100), to the distance from the basion to the
        middle of the front edge of the upper jaw; -- called also
        alveolar index.
        [1913 Webster]
              Skulls with the gnathic index below 98 are
              orthognathous, from 98 to 103 mesognathous, and
              above 103 are prognathous.            --Flower.
        [1913 Webster]

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