prognathous

from WordNet (r) 3.0 (2006)

prognathous
    adj 1: having a projecting lower jaw [syn: {prognathous},
           {prognathic}, {hypognathous}] [ant: {opisthognathous}]

from The Collaborative International Dictionary of English v.0.48

Prognathous \Prog"na*thous\ (pr[o^]g"n[.a]*th[u^]s), a. [Gr.
   pro` before + gna`qos the jaw] (Anat.)
   Having the jaws projecting beyond the upper part of the face;
   -- opposed to {orthognathous}. See {Gnathic index}, under
   {Gnathic}.
   [1913 Webster]

         Their countenances had the true prognathous character.
                                                  --Kane.
   [1913 Webster]