Webster's Revised Unabridged Dictionary
Ortho-, + Gr. gna`qos the jaw
Chambers's Twentieth Century Dictionary
Gr. orthos, straight, gnathos, the jaw.
I do not see that an orthognathous face would cost more than a prognathous face; or a good morale than a bad one.
"More Letters of Charles Darwin Volume II" by Charles Darwin
Surgical orthodontics , also known as orthognathic surgery, consists of a combination of orthodontic treatment (usually braces) and jaw surgery.
The International Journal of Adult Orthodontics & Orthognathic Surgery (Published from 1986-2002).
The International Adult Orthodontics & Orthognathic Surgery Winter Volume 17, Issue 4.