tartar
n[U]
1 hard chalky deposit that forms on the teeth 牙垢; 牙石. Cf 參看 plaque2.2 reddish deposit that forms on the inside of a cask in which wine is fermented 酒石(形成於酒的發酵桶內側者).
tartar n person who has a violent temper or is difficult to deal with 脾氣暴躁的人; 難對付的人.