Tri'er-ärch, n.

n. [Lat. trierarchus, Gr. τριήραρχος, from τριήρης, a trireme, and ἀρχός, a leader, a chief, from ἄρχειν, to be first, to lead, rule; Fr. triérarque.] (Gr. Antiq.) The commander of a trireme; especially, in Athens, one who, at his own expense, equipped the vessel, kept it in repair, and procured the crew.