tartar tartar /ˈtɑːrtɝ/

noun

1. An incrustation that forms on the teeth and gums  ( calculus , tartar , tophus )
   an incrustation that forms on the teeth and gums
   
   
2. A fiercely vigilant and unpleasant woman  ( dragon [Informal] , tartar )
   a fiercely vigilant and unpleasant woman
   
3. A salt used especially in baking powder  ( cream of tartar , potassium bitartrate , potassium hydrogen tartrate , tartar )
   a salt used especially in baking powder
   
   

 Tartar

1. A member of the Mongolian people of central Asia who invaded Russia in the 13th century  ( Mongol Tatar , Tartar , Tatar )
   a member of the Mongolian people of central Asia who invaded Russia in the 13th century