Lewis Short
gymnăsĭarchus | gym-năsĭarcha, ae (noun M.m) = γυμνασίαρχος:
* The master of a gymnasium, a gymnasiarch, Cic. Verr. 2, 4, 42, § 92; Sid. Ep. 2, 2; Val. Max. 9, 10, 2ext.—Also, , , , = γυμνασιάρχης, Val. Max. 9, 12, 7 ext.; Inscr. Grut. 465, 2.
Charlton T. Lewis, Charles Short, A Latin Dictionary