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countable and uncountable, plural tartars
A red compound deposited during wine making; mostly potassium hydrogen tartrate — a source of cream of tartar. examples
A hard yellow deposit on the teeth, formed from dental plaque. examples
plural tartars
(dated) A fearsome or angrily violent person. quotations examples
Mrs. Begg said she liked Mrs. Dain, who was a sensible woman and a first-rate housewife, but that Gabrielle was a tartar.
1929, Dashiell Hammett, chapter 3, in The Dain Curse, New York: Vintage, published 1972, page 28