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bireme
A bireme is an ancient oared warship (galley) with two decks of oars, probably invented by the Phoenicians. Long vessels built for military purposes had relatively high speed, meticulous construction, strength, and depending on the number of rows of oars, were called ''uniremes'', ''biremes'', ''triremes'', ''quadriremes'', etc.
==Description==
The name bireme comes from "bi-" meaning two and "-reme" meaning oar.
It was typically about long with a maximum beam width of around . It was modified from the penteconter, a ship that had only one set of oars on each side, the bireme having two sets of oars on each side. The bireme was twice the triaconter's length and height, and thus employed 120 rowers. Biremes were galleys, galleasses, dromons, and small pleasure crafts pamphyles.
The next development, the trireme, keeping the length of the bireme, added a tier to the height, the rowers being thus increased to 180. It also had a large square sail.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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