the GNU version of the Collaborative International Dictionary of English
n. A chief or transcendent traitor.
The Century Dictionary and Cyclopedia
n. A chief traitor: sometimes applied specifically to the devil. Hakewill.
Word Usage
"'These charges included complicity with the archtraitor Gorlot in the genocide of the Tanes; furnishing drugs capable of inhibiting and demoralizing certain officials in our government and ¦' Lesatin glanced at his note slate, 'illicit surgery.'"