Webster's English Dictionary

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mordant

1. mor.dant \'mo.rd-*nt\ aj [MF, prp. of mordre to bite, fr. L morde-re] 1: 
   biting and caustic in thought, manner, or style : INCISIVE  2: acting as a 
   mordant  3: BURNING, PUNGENT  - mor.dant.ly av
2. mordant n 1: a chemical that fixes a dye in or on a substance by 
   combining with the d ye to form an insoluble compound 2: a corroding 
   substance used in etching 
3. mordant vt : to treat with a mordant