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Webster's 1913 Dictionary

ORTHOGNATHOUS

Or *thog "na *thous, a. Etym: [Ortho- + Gr. (Anat. )

Defn: Having the front of the head, or the skull, nearly perpendicular, not retreating backwards above the jaws; -- opposed to Ant: prognathous. See Gnathic index, under Gnathic.

New American Oxford Dictionary

orthognathous

or thog na thous |ôrˈTHägnəTHəs ɔrˈθɑɡnəθəs | ▶adjective Anatomy (esp. of a person ) having a jaw that does not project or recede, so that the facial profile is nearly vertical. ORIGIN mid 19th cent.: from ortho- ‘straight ’ + Greek gnathos ‘jaw ’ + -ous .

Oxford Dictionary

orthognathous

orthognathous |ˌɔːθəgˈneɪθəs, ɔːˈθɒgnəθəs | ▶adjective Anatomy (especially of a person ) having a jaw which does not project forwards and a facial angle approaching a right angle. ORIGIN mid 19th cent.: from ortho- ‘straight ’ + Greek gnathos ‘jaw ’ + -ous .