Definition of 'seal'

Noun

1. fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters
      Synonyms: sealing wax
2. a device incised to make an impression; used to secure a closing or to authenticate documents
      Synonyms: stamp
3. the pelt or fur (especially the underfur) of a seal; "a coat of seal"
      Synonyms: 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"
      Synonyms: Navy 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
      Synonyms: cachet 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

Verb

1. close with or as if with a seal; "She sealed the letter with hot wax"
      Antonyms: unseal
2. make tight; secure against leakage; "seal the windows"
      Synonyms: seal off
3. decide irrevocably; "sealing dooms"
4. affix a seal to; "seal the letter"
5. cover with varnish
      Synonyms: varnish
6. hunt seals

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