tar·tar
noun/ˈtɑːtə(r)/
/ˈtɑːrtər/
- [uncountable] a hard substance that forms on teeth
牙石；牙垢 - a build-up of tartar
牙垢堆积
- a build-up of tartar
- [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
Word Originlate Middle English: via medieval Latin from medieval Greek tartaron, of unknown origin.