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Synonyms
mor·dant (môŕdnt)

[French, from Old French present participle of mordre, to bite, from Vulgar Latin* mordere, from Latin mordēre.]

adjective 

    1. Bitingly sarcastic: mordant satire.
    2. Incisive and trenchant: an inquisitor's mordant questioning.
  2. Bitingly painful.
  3. Serving to fix colors in dyeing.

noun 

  1. A reagent, such as tannic acid, that fixes dyes to cells, tissues, or textiles or other materials.
  2. A corrosive substance, such as an acid, used in etching.

transitive verb: -dant·ed, -dant·ing, -dants. 

To treat with a mordant.

derivatives

moŕdan·cy
noun
moŕdant·ly
adverb