ORTHOGNATHOUS

Etymology

Adjective

orthognathous (comparative more orthognathous, superlative most orthognathous)

(anatomy) straight-jawed

Source: Wiktionary

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

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition