Adjective mordant has 1 sense
  1. black, grim, mordant - harshly ironic or sinister; "black humor"; "a grim joke"; "grim laughter"; "fun ranging from slapstick clowning ... to savage mordant wit"
    Antonym: unsarcastic (indirect, via sarcastic)
,Noun mordant has 1 sense
  1. mordant - a substance used to treat leather or other materials before dyeing; aids in dyeing process
    --1 is a kind of
    coloring material, colouring material, color, colour
    --1 has particulars:
     chrome alum; tartar emetic, antimony potassium tartrate; sodium dichromate, sodium bichromate
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