Ex"arch (?), n. [L. exarchus, Gr. commander; ,, out + to lead, rule: cf. F. exarque.]
A viceroy; in Ravenna, the title of the viceroys of the Byzantine emperors; in the Eastern Church, the superior over several monasteries; in the modern Greek Church, a deputy of the patriarch , who visits the clergy, investigates ecclesiastical cases, etc.
© Webster 1913.