an ancient vessel and a type of galley that was used by the ancient maritime civilizations of the Mediterranean, especially the Phoenicians, ancient Greeks and Romans.
[It] derives its name from its three rows of oars, manned with one man per oar.
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image: By Eric Gaba (Sting - fr:Sting) - Own work ; based upon a drawing of Jean Taillardat in La Trière athénienne et la guerre sur mer aux Ve et IVe siècles, 1968., CC BY-SA 3.0,
Imagine the feelings of a commander of a fine—what d'ye call 'em?—trireme in the Mediterranean, ordered suddenly to the north; run overland across the Gauls in a hurry; put in charge of one of these craft the legionaries,—a wonderful lot of handy men they must have been too—used to build, apparently by the hundred, in a month or two, if we may believe what we read.
Joseph Conrad. The Heart of Darkness
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You have no cities nor no wealth: our cities are hives of humanity and our galleys, trireme and quadrireme, laden with all manner merchandise furrow the waters of the known globe.