UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈtraɪriːm/US:USA pronunciation: respellingUSA pronunciation: respelling(trīrēm)

WordReference Random House Unabridged Dictionary of American English © 2020
tri•reme  (trīrēm),USA pronunciation n.  Class. Hist.
  1. Ancient History, Antiquitya galley with three rows or tiers of oars on each side, one above another, used chiefly as a warship.
  • Latin trirēmis having three banks of oars, equivalent. to tri- tri- + rēm(us) oar + -is adjective, adjectival suffix
  • 1595–1605

Collins Concise English Dictionary © HarperCollins Publishers::
trireme /ˈtraɪriːm/ n
  1. a galley, developed by the ancient Greeks as a warship, with three banks of oars on each side
Etymology: 17th Century: from Latin trirēmis, from tri- + rēmus oar
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