piston ring

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.


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World English Dictionary
piston ring
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 10th Edition
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Example sentences
It became one of the largest piston ring manufacturers in the world.
Oil consumption and crankcase contamination are reduced by using a newly
  designed upper piston and piston ring.
The failed piston ring seals were fabricated from resin impregnated leather.
Piston ring wall thickness was increased to displace refrigerant gas in the
  ring groove of the piston.
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