1. a flat piece of rubber, cork, or other material placed between two surfaces to prevent leakage

Examples

• The mechanic replaced the blown head gasket in the engine.
• Make sure the gasket is properly seated before tightening the bolts.
• A faulty gasket can cause oil to leak from the transmission.
• The plumber installed a new gasket in the pipe joint.
• Check the gasket around the water pump for signs of wear.
• The rubber gasket creates a watertight seal between the two metal parts.