cream of tartar
US /ˌkriːm əv ˈtɑːr.tər/
UK /ˌkriːm əv ˈtɑːr.tər/
1.
a white, crystalline acidic compound obtained as a by-product of wine fermentation and used in baking powder and as a mild laxative.
:
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Add a pinch of cream of tartar to stabilize egg whites.
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Cream of tartar is often used in baking to help leavening.