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Definition of TARTAR
: a substance consisting essentially of cream of tartar that is derived from the juice of grapes and deposited in wine casks together with yeast and other suspended matters as a pale or dark reddish crust or sediment; especially: a recrystallized product yielding cream of tartar on further purification
: an incrustation on the teeth consisting of plaque that has become hardened by the deposition of mineral salts (as calcium carbonate)
Origin of TARTAR
Middle English, from Anglo-French, from Medieval Latin tartarum