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a barkentine square-rigged on the mainmast above a gaff mainsail.

Also called four-mast·ed brig [fawr, -, mas, -tid , brig]. a sailing ship having four or more masts, the foremast and mainmast being wholly square-rigged, the others being fore-and-aft-rigged.

any sailing ship of three or more masts carrying an otherwise nameless rig.