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”

close with or as if with a seal

“She sealed the letter with hot wax”

decide irrevocably

“sealing dooms”

fastener that provides a tight and perfect closure

hunt seals

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

make tight; secure against leakage

“seal the windows”

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”