English version

piston ring

From Longman Dictionary of Contemporary English
Related topics: Motor vehicles
piston ringˈpiston ring noun [countable]  TTCa circular metal spring used to stop gas or liquid escaping from between a piston and the tube that it moves in
Examples from the Corpus
piston ringPardue's aircraft had metal on the oil filter screens as well as part of a piston ring.
Pictures of the day
Do you know what each of these is called?
Click on the pictures to check.