Prog″na‐thous (?), a.(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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.