Three-decker
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This article is about the type of warship. For the residential building type, see Triple decker. For the book format, see Three-volume novel.
A three-decker is a sail warship which carried her guns on three fully-armed decks. Usually additional guns were carried on the upper works (forecastle and quarterdeck) but this was not a continuous battery and so did not count. Three-deckers were usually ships of the line, classed as first-rate or second-rate.