Tartar

(noun) a salt used especially in baking powder. Synonyms: cream of tartar, tartar, potassium bitartrate, potassium hydrogen tartrate.

(noun) a fiercely vigilant and unpleasant woman. Synonyms: dragon, tartar.

(noun) a member of the Mongolian people of central Asia who invaded Russia in the 13th century. Synonyms: Tatar, Mongol Tatar.

(noun) an incrustation that forms on the teeth and gums. Synonyms: tartar, calculus, tophus.