From WordNet (r) 3.0 (2006):
seal
n 1: fastener consisting of a resinous composition that is
plastic when warm; used for sealing documents and parcels
and letters [syn: sealing wax, seal]
2: a device incised to make an impression; used to secure a
closing or to authenticate documents [syn: seal, stamp]
3: the pelt or fur (especially the underfur) of a seal; "a coat
of seal" [syn: seal, sealskin]
4: a member of a Naval Special Warfare unit who is trained for
unconventional warfare; "SEAL is an acronym for Sea Air and
Land" [syn: Navy SEAL, SEAL]
5: a stamp affixed to a document (as to attest to its
authenticity or to seal it); "the warrant bore the sheriff's
seal"
6: an indication of approved or superior status [syn: cachet,
seal, seal of approval]
7: a finishing coat applied to exclude moisture
8: fastener that provides a tight and perfect closure
9: any of numerous marine mammals that come on shore to breed;
chiefly of cold regions
v 1: make tight; secure against leakage; "seal the windows"
[syn: seal, seal off]
2: close with or as if with a seal; "She sealed the letter with
hot wax" [ant: unseal]
3: decide irrevocably; "sealing dooms"
4: affix a seal to; "seal the letter"
5: cover with varnish [syn: varnish, seal]
6: hunt seals