°A sail
warship, which carried her guns on two fully-armed decks. Usually additional guns were carried on the upper works (
forecastle and
quarterdeck) but this was not a continuous battery so were not counted. Two-deckers ranged all the way from the small 40-gun
fourth-rate up to 80- or even 90-gun ships, with the
third-rate or "
seventy-four" being the archetype.