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tartar

noun
🔊/ˈtɑːtə(r)/
🔊/ˈtɑːrtər/
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  1. [uncountable] a hard substance that forms on teeth牙石；牙垢
    • a build-up of tartar牙垢的积累
    Topics Bodyc2
  2. [countable] (old-fashioned) a person in a position of authority who is strict and easily made angry 暴君；脾气暴躁的掌权者
    3. Word Originlate Middle English: via medieval Latin from medieval Greek tartaron, of unknown origin.