tartar


tartar (http://definr.com/tartar)

     n 1: a salt used especially in baking powder [syn: {cream of
          tartar}, potassium hydrogen tartrate]
     2: a fiercely vigilant and unpleasant woman [syn: dragon]
     3: a member of the Mongolian people of central Asia who invaded
        Russia in the 13th century [syn: Tatar, Tartar, {Mongol
        Tatar}]
     4: an incrustation that forms on the teeth and gums [syn: calculus]