Webster’s Revised Unabridged Dictionary · 1913
Prognathous
Prog′na·thous, a. [Gr. πρό before + γνάθος the jaw] (Anat.) Having the jaws projecting beyond the upper part of the face; — opposed to orthognathous. See Gnathic index, under Gnathic.
Their countenances had the true prognathous character. Kane.