A vessel with two hulls flanking the main hull (8)

I believe the answer is:

trimaran

(Other definitions for trimaran that I've seen before include "Three-hulled vessel" , "Sailing boat with three hulls" , "Sailing boat with 3 hulls" , "Three-hulled yacht" , "Ocean vessel with three hulls side by side" .)

I've seen this clue in The Independent.

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