1. Make tight; secure against leakage
   "seal the windows";
   - seal off
    
2. Close with or as if with a seal
   "She sealed the letter with hot wax"
    
3. Affix a seal to
   "seal the letter"
    
4. Decide irrevocably
   "sealing dooms"
    
5. Cover with varnish
   "He sealed the wooden table to protect it";
   - varnish
    
6. Hunt seals
   "The Inuit sealed on the ice floes"

1. A stamp affixed to a document (as to attest to its authenticity or to seal it)
   "the warrant bore the sheriff's seal"
    
2. Fastener that provides a tight and perfect closure
   "The rubber seal on the jar lid kept the contents fresh"
    
3. A device incised to make an impression; used to secure a closing or to authenticate documents
   "The notary applied her official seal to the contract";
   - stamp
    
4. Fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters
   "She dripped red seal onto the envelope and pressed her signet ring into it";
   - sealing wax
    
5. A finishing coat applied to exclude moisture
   "They applied a waterproof seal to the deck"
    
6. An indication of approved or superior status
   "The product proudly displayed the consumer association's seal of approval";
   - cachet, seal of approval
    
7. Any of numerous marine mammals that come on shore to breed; chiefly of cold regions
   "Seals basked on the rocky shore"
    
8. The pelt or fur (especially the underfur) of a seal
   "a coat of seal";
   - sealskin

1. (military) a member of a Naval Special Warfare unit who is trained for unconventional warfare
   "SEAL is an acronym for Sea Air and Land";
   - Navy SEAL

Sounds like: sea, sea

Derived forms: sealing, seals, sealed, SEALs

Type of: accolade, affix, award, bluejacket, close, coat, coating, decide, determine, device, fastener, fastening, fill up, fixing, fur, holdfast, honor [US], honour [Brit, Cdn], hunt, hunt down, impression, laurels, make up one's mind, pelt, pinniped, pinniped mammal, run, sailor, shut, stamp, stick on, surface, track down

Antonym: unseal

Part of: Naval Special Warfare, NSW

Encyclopedia: Seal, Mark