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

 

trimaran

 noun
noun
BrE BrE//ˈtraɪməræn//
 
; NAmE NAmE//ˈtraɪməræn//
 
Types of boats and ships, Boating
 
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a fast sailing boat like a catamaran, but with three hulls instead of two See related entries: Types of boats and ships, Boating Word Origin 1940s: from tri- + catamaran.
See the Oxford Advanced American Dictionary entry: trimaran