A small tower or tower-shaped projection on a building. A low, heavily armored structure, usually rotating horizontally, containing mounted guns and their gunners or crew, as on a warship or tank. A domelike gunner's enclosure projecting from the fuselage of a combat aircraft. A tall wooden structure mounted on wheels and used in ancient warfare by besiegers to scale the walls of an enemy fortress. An attachment for a lathe consisting of a rotating cylindrical block holding various cutting tools. A rotating device holding various lenses, as for a microscope, allowing easy switching from one lens to another.