(~s)
1.
Tartar is a hard yellowish substance that forms on your teeth and causes them to decay if it is not removed.
N-UNCOUNT
2.
If you describe someone, especially a woman in a position of authority, as a ~, you mean that they are fierce, bad-tempered, and strict. (INFORMAL)
She can be quite a ~.
N-COUNT
3.
see also cream of ~