piston ring

piston ring

n.

An adjustable split metal ring that fits around a piston and seals the gap between the piston and the cylinder wall.

Thesaurus

Noun

1.

piston ring - seal consisting of a split metal ring that seals the gap between a piston and the cylinder wall piston, plunger - mechanical device that has a plunging or thrusting motion seal - fastener that provides a tight and perfect closure