An urn is a vase, ordinarily covered, that usually has a narrowed neck above a footed pedestal. “Knife urns” placed on pedestals flanking a dining-room sideboard were an English innovation for high-style dining rooms of the late 1760s. They went out of fashion in the following decade, in favour of knife boxes that were placed on the sideboard. In Classical terms, an urn is a large decorative covered container of wood, metal, pottery, etc.