cream of tartar

noun
a white, crystalline, water-soluble powder, C 4 H 5 KO 6 , used chiefly as an ingredient in baking powders and in galvanic tinning of metals. Also called potassium bitartrate, potassium acid tartrate. Compare tartar ( def 3 ).

Origin:
1655–65

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World English Dictionary
cream of tartar
 
n
another name for potassium hydrogen tartrate, esp when used in baking powders

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Meanwhile, beat egg whites to soft peaks with cream of tartar in electric mixer.
Beat whites with cream of tartar and salt using an electric mixer at medium
  speed until they hold soft peaks.
Meanwhile, beat whites with a pinch of salt in bowl of mixer until foamy, then
  beat in cream of tartar.
The somber science of heating flour and water and cream of tartar prevented us
  from gazing out the ivy-shaded windows.
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