1. An acid concrete salt, formed from wines completely fermented, and adhering to the sides of the casks in the form of a hard crust. It is white or red, the white being most esteemed. In its crude state, it is much used as a flux in the assaying of ores.

Tartar is a supertartrate of potash; that is, a compound of tartaric acid and potash, having the acid in excess.

2. A person of a keen irritable temper.

3. A native of Tartary; a corruption of Tatar.

T`ARTAR, n. [L. Tartarus.] Hell. [Not in use.]