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The Collaborative International Dictionary
Mesognathous

Mesognathous \Me*sog"na*thous\, a. [Meso- + Gr. gna`qos jaw.] (Anat.) Having the jaws slightly projecting; between prognathous and orthognathous. See Gnathic index, under Gnathic.

Wiktionary
mesognathous

a. (context anatomy English) having the jaws slightly projecting; between prognathous and orthognathous