What is the meaning of Piston ring?

A spring packing ring or any of several such rings, for a piston.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). piston ring. Retrieved September 24, 2026, from http://smartdefine.org/piston_ring/definitions/2045898
ChicagoWebster's. 2011. "piston ring" http://smartdefine.org/piston_ring/definitions/2045898 (accessed September 24, 2026).
HarvardWebster's 2011, piston ring, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/piston_ring/definitions/2045898>.
MLAWebster's. "piston ring" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/piston_ring/definitions/2045898>
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