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piston ring

noun

  1. 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.


piston ring

noun

  1. 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
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of piston ring1

First recorded in 1865–70
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Example Sentences

This was probably done to reduce vibration and the problem of piston-ring sealing.

What would it mean to you to know that you were not losing steam power because of a faulty piston-ring?

The piston ring removers are easily made from thin strips of sheet metal securely brazed or soldered to a light wire handle.

At the end of the fifth mile, the launch ahead of them dropped out of the struggle with a broken piston ring.

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