piston ring


noun

a metallic ring, usually one of a series, and split so as to be expansible, placed around a piston in order to maintain a tight fit, as inside the cylinder of an engine.
Also called packing ring, ring.

Origin of piston ring

First recorded in 1865–70

Words nearby piston ring

Example sentences from the Web for piston ring

British Dictionary definitions for piston ring

piston ring

noun

a split ring, usually made of cast iron, that fits into a groove on the rim of a piston to provide a spring-loaded seal against the cylinder wall