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Pronunciation: tar'tar


  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.

Synonym(s): dental calculus2

[Mediev. L. tartarum, ult. etym. unknown]

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