Date: 1662 a white crystalline salt C 4 H 5 KO 6 used especially in baking powder and in certain treatments of metals
CREAM OF TARTAR
Meaning of CREAM OF TARTAR in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012