fastener that provides a tight and perfect closure, including:
Mechanical Seal
Rubber Seal
Oil Seal
Hydraulic Seal

Any aquatic carnivorous mammal of the families Phocidæ and Otariidæ.

the pelt or fur (especially the underfur) of a seal; "a coat of seal"

any of numerous marine mammals that come on shore to breed; chiefly of cold regions

a sea mammal that has thick fur and flippers and lives in water.

A member of a group of marine mammals that have fur, blubber, and no earlobes on the sides of their heads. Seals are graceful swimmers, but move only clumsily on land.