tartar - definition and synonyms

noun 

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/ˈtɑː(r)tə(r)/
singulartartar
pluraltartars
  1. 1
    [uncountable] a hard substance that forms on your teeth and can cause them to decay
     Synonyms and related words
  2. 2
    [countable] informal an unpleasant person who is often angry or violent, usually someone in a position of power