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baking soda

noun
🔊/ˈbeɪkɪŋ səʊdə/
🔊/ˈbeɪkɪŋ səʊdə/
(also bicarbonate of soda, sodium bicarbonate, informal bicarb)
[uncountable]
(symbol NaHCO3)
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  1. a chemical in the form of a white powder that dissolves (= becomes a liquid or forms part of a liquid) and is used in baking to make cakes, etc. rise and become light, and in making fizzy drinks and some medicines碳酸氢钠；小苏打