Definition of trireme noun from the Oxford Advanced Learner's Dictionary

 

trireme

 noun
noun
BrE BrE//ˈtraɪriːm//
 
; NAmE NAmE//ˈtraɪriːm//
 
 
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a long flat ship with three rows of oars on each side, used in war by the ancient Greeks and Romans Word Originfrom Latin triremis, from tri- ‘three’ + remus ‘oar’.
See the Oxford Advanced American Dictionary entry: trireme