Found 2 items, similar to piston ring.
English → English (WordNet) Definition: piston ring piston ring n : seal consisting of a split metal ring that seals the gap between a piston and the cylinder wall
English → English (gcide) Definition: Piston ring Piston ring \Pis"ton ring\ (Mach.) A spring packing ring, or any of several such rings, for a piston. [Webster 1913 Suppl.]