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1. A crust on the interior of wine casks, consisting essentially of potassium bitartrate. 2. A white, brown, or yellow-brown deposit at or below the gingival margin of teeth, chiefly hydroxyapatite in an organic matrix. SYN: dental calculus (2). [Mediev. L. tartarum, ult. etym. unknown]
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tar·tar 'tärt-ər n an incrustation on the teeth consisting of plaque that has become hardened by the deposition of mineral salts (as calcium carbonate)
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n.
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tar·tar (tahrґtər) [L. tartarum; Gr. tartaron] 1. dental calculus. 2. crude potassium bitartrate.Medical dictionary. 2011.