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piston British & World English

A disc or short cylinder fitting closely within a tube in which it moves up and down against a liquid or gas, used in an internal-combustion engine to derive motion, or in a pump to impart motion

piston ring British & World English

A ring on a piston sealing the gap between the piston and the cylinder wall

piston rod British & World English

A rod or crankshaft attached to a piston to drive a wheel or to impart motion

piston corer British & World English

A piston-driven cylindrical device for taking samples of material from the seabed

piston engine British & World English

An engine, especially in an aircraft, in which power is derived from cylinders and pistons rather than a turbine