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Definition of seal:

  1. A compound hydraulic valve for regulating the passage of the gas through a set of purifiers so as to cut out each one in turn for the renewal of the lime.
  2. Among the Mormons, to confirm or set apart as a second or additional wife.
  3. An arrangement for preventing the entrance or return of gas or air into a pipe, by which the open end of the pipe dips beneath the surface of water or other liquid, or a deep bend or sag in the pipe is filled with the liquid; a draintrap.
  4. An engraved or inscribed stamp, used for marking an impression in wax or other soft substance, to be attached to a document, or otherwise used by way of authentication or security.
  5. Any aquatic carnivorous mammal of the families Phocidae and Otariidae.
  6. Hence, to shut close; to keep close; to make fast; to keep secure or secret.
  7. That which confirms, ratifies, or makes stable; that which authenticates; that which secures; assurance.
  8. That which seals or fastens; esp., the wax or wafer placed on a letter or other closed paper, etc., to fasten it.
  9. To affix one's seal, or a seal.
  10. To close by means of a seal; as, to seal a drainpipe with water. See 2d Seal, 5.
  11. To fasten with a seal; to attach together with a wafer, wax, or other substance causing adhesion; as, to seal a letter.
  12. To fix, as a piece of iron in a wall, with cement, plaster, or the like.
  13. To mark with a stamp, as an evidence of standard exactness, legal size, or merchantable quality; as, to seal weights and measures; to seal silverware.
  14. To set or affix a seal to; hence, to authenticate; to confirm; to ratify; to establish; as, to seal a deed.
  15. Wax, wafer, or other tenacious substance, set to an instrument, and impressed or stamped with a seal; as, to give a deed under hand and seal.

Synonyms:

mould, revenue stamp, cast, seal of approval, sealing wax, seal off, mold, postage stamp, stamp, impression, pestle, tender, sealskin, lettre de cachet, cachet, varnish, legal tender, blockade, postage.

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