round ships

A form of round ship — A superclass of wooden sailing ship type with a length-to-beam ratio of roughly two to one and normally having one mast with a single square-rigged sail, used as a generic term encompassing most European ancient and mediaeval ships up to the Age of Sail except galleys and longships, variously including or excluding cogs and coccas (the length-to-beam ratio of which could rise to over three to one); a ship (type) of this class.