A seal, typically made of rubber, metal, cork, or similar material, placed between two mating surfaces to prevent the escape or ingress of a fluid or gas.

The mechanic fitted a new metal gasket between the cylinder head and the engine block.

Nautical: a short length of rope or band used for securing a furled sail to a spar.

Once the sail was lowered, the deckhand fastened the gaskets to keep it neatly wrapped.

gasketadjective

Relating to or designed for gaskets.

She specialized in gasket materials for high-pressure applications.