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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.
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


Read Also:

  • Piston-pin

    noun 1. .

  • Piston-rod

    noun 1. a rod communicating the rectilinear motion of a piston to the small end of a connecting rod or elsewhere. noun 1. the rod that connects the piston of a reciprocating steam engine to the crosshead 2. a less common name for a connecting rod

  • Piston slap

    noun 1. the characteristic sound of a seriously worn piston in a cylinder (usually of the engine of a motor car)

  • Pistou

    [pee-stoo] /piˈstu/ 1. a paste or sauce from Provençe made of basil, garlic, olive oil, and sometimes Parmesan cheese and tomato paste. 2. a vegetable soup flavored with pistou.

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