a vessel similar to a catamaran but having three separate hulls.

1950–55; tri- + (cata)maran Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trimaran (ˈtraɪməˌræn)
a vessel, usually of shallow draught, with two hulls flanking the main hull
[C20: from tri- + (cata)maran]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
On board this miniature trimaran are four acoustic transducers.
Oracle spared even less expense, devising a paradigm-breaking trimaran with a wing for a sail.
Choose a catamaran or trimaran for your day-sailing experience if you are unsure of your party's sea legs.
However, certain exterior spaces were identified as being wide enough to accommodate trimaran boats.
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