trireme

An ancient Greek or Roman galley or warship, having three tiers of oars on each side.

A vessel with three benches, ranks, or tiers of oars on a side: a type of ancient Greek war-ship of great efficiency, copied by the Romans and other peoples.

An ancient galley or vessel with tree banks, or tiers, of oars.

A galley with three banks of oars, one above the other, used mainly as a warship.

ancient Greek or Roman galley or warship having three tiers of oars on each side