1
: an incrustation on the teeth consisting of plaque that has become hardened by the deposition of mineral salts (such as calcium carbonate)
2
: 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
1
capitalized
: a native or inhabitant of Tartary
2
capitalized
: tatar sense 2
3
often capitalized
: a person of irritable or violent temper
4
: one that proves to be unexpectedly formidable
Tartar
adjective
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Merriam-Webster unabridged
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