A ring on a piston sealing the gap between the piston and the cylinder wall.
More example sentences
- Random leak testing is also recommended because any cylinder leakage indicates a bent valve or a faulty piston ring.
- The downside is that tiny amounts of oil can force their way up past the piston ring into the combustion chamber.
- Something was broken and Bill and I suspected he'd blown a piston ring.
Definition of piston ring in:
- The British & World English dictionary