Lewis Short
archĭātrus | -ŏs (noun M) = ἀρχίατρος: (), , , = ; in the time of the emperors
* The chief physician, who was at the same time physician in ordinary to the emperor, Cod. Th. 12, 13; Inscr. Orell. 3994; 4017; 4226 al.
Charlton T. Lewis, Charles Short, A Latin Dictionary