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Definition of bittern:

  1. A very bitter compound of quassia, cocculus Indicus, etc., used by fraudulent brewers in adulterating beer.
  2. A wading bird of the genus Botaurus, allied to the herons, of various species.
  3. The brine which remains in salt works after the salt is concreted, having a bitter taste from the chloride of magnesium which it contains.

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