Gym*na"si*arch (j&ibreve;m*nā"z&ibreve;*ärk), n. [L. gymnasiarchus, Gr. gymnasi`archos; gymna`sion + 'a`rchein to govern: cf. F. gymnasiarque.] (Gr. Antiq.) An Athenian officer who superintended the gymnasia, and provided the oil and other necessaries at his own expense.