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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]