seal

A member of a Naval Special Warfare unit who is trained for unconventional warfare.

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

A stamp affixed to a document (as to attest to its authenticity or to seal it).

“the warrant bore the sheriff's seal”

Fastener that provides a tight and perfect closure.

Fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters.

A device incised to make an impression; used to secure a closing or to authenticate documents.

The pelt or fur (especially the underfur) of a seal.

“a coat of seal”

An indication of approved or superior status.

A finishing coat applied to exclude moisture.

Close with or as if with a seal.

“She sealed the letter with hot wax”

Decide irrevocably.

“sealing dooms”

Hunt seals.

Make tight; secure against leakage.

“seal the windows”

Cover with varnish.

Affix a seal to.

“seal the letter”