Noun

Definition: a hard calcified deposit that forms on the teeth and contributes to their decay

Ex. The dentist checks your teeth for tartar when they do a cleaning.

Noun

Definition: a member of the combined forces of central Asian peoples, including Mongols and Turks, who under the leadership of Genghis Khan conquered much of Asia and eastern Europe in the early 13th century, and under Tamerlane (14th century) established an empire with its capital at Samarkand.

Ex. In the 13th century, the Europeans were worried about invasion by the Tartars.

Noun

Definition: a harsh, fierce, or intractable person

Ex. My grandfather was a tartar of a man; my dad doesn’t really talk to him now.