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Definition of 'tartar'. tartar. Tartar is a hard yellowish substance that forms on your teeth and causes them to decay if it is not removed. If you describe someone, especially a woman in a position of authority, as a tartar, you mean that they are fierce, bad-tempered, and strict. She can be quite a tartar.
Tartar refers to mineral deposits on the teeth, both above and below the gums that have hardened. These deposits are easy to recognize since they tend to stain easily, and you may note places on the teeth with brown or yellow stains. These stains are usually not on the teeth themselves but to tartar, also called calculus, buildup. This buildup is distinct from plaque, which is caused by bacteria on the teeth, but both are usually present in the mouths of people who have poor oral hygiene.