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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

The companies most endangered may be small machine shops in Michigan or Ontario that produce piston rings and other parts.

The piston rings may not have been properly heat-treated, which can cause engine damage, oil leaks and possible fires.

Mr. Carlisle, the racer, said the Ford engine that had been in his Mustang required new bearings and piston rings after every race.

Then Uncle Hermilio asked Lucky about his car, and Lucky started talking about valves and piston rings and carburetors.

He rested his hand on a rack of piston ring installers and timing gear pullers, and this man who lost so much of his family to hurricanes started talking about the parts of them.

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