Three-decker

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Batteries of the 118-gun Océan
Batteries of the 118-gun Océan

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.

The term three-decker was also often used to refer to a three-volume novel, the standard form for publishing English-language novels from about the 1830s to 1880s.

Three-decker can also refer to a triple decker, a three-level housing unit.