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Definition of mordant:

  1. Any corroding substance used in etching.
  2. Any sticky matter by which the gold leaf is made to adhere.
  3. Any substance, as alum or copperas, which, having a twofold attraction for organic fibers and coloring matter, serves as a bond of union, and thus gives fixity to, or bites in, the dyes.
  4. Biting; caustic; sarcastic; keen; severe.
  5. Serving to fix colors.
  6. To subject to the action of, or imbue with, a mordant; as, to mordant goods for dyeing.


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