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From The Collaborative International Dictionary of English v.0.48:
Orthognathous \Or*thog"na*thous\, a. [Ortho- + Gr. gna`qos the jaw.] (Anat.) Having the front of the head, or the skull, nearly perpendicular, not retreating backwards above the jaws; -- opposed to prognathous. See Gnathic index, under Gnathic. [1913 Webster]