tartar

US /ˈtɑːr.t̬ɚ/
UK /ˈtɑːr.t̬ɚ/
"tartar" picture
1.

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

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Regular brushing helps prevent the buildup of tartar.
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The dentist removed the tartar from my teeth during the cleaning.
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dental calculuscalculus
2.

a fierce or difficult person, especially a woman

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She's a real tartar when it comes to negotiating.
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Beware of the old lady; she's a bit of a tartar.
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shrewviragotermagantdragonharpy
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tartar saucecream of tartarsteak tartare