To move up and down or in and out like a piston.
A solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)
A valve device in some brass instruments for changing the pitch
A tool used in peat cutting or for marking off ground.
A type of plough used by lumberjacks to carve a track for a sleigh.
A horseman or cavalryman, especially a German one, associated with the wars of the 16th and 17th centuries.
A set of instructions for navigating a course at sea; a pilot's book or seaman's guide.
The penis.