This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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• Wordscraper
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n. A boat with two or more hulls.

"For VPLP, the challenge consisted of designing a fully crewed, no compromise multihull, which is totally versatile but very high-performing, suitable for a mixed programme, which is always seaworthy but cutting edge and progressive, but which always preserves the safety of the crew on board."

monohull   

multihulled