baking soda noun
Learner's definition of BAKING SODA
[noncount]
: a kind of salt that is used to make baked foods (such as cookies and breads) light and fluffy小苏打(发酵粉的成分之一) ◊ Baking soda is one of the ingredients in baking powder.小苏打(发酵粉的成分之一)
— called also bicarb, bicarbonate of soda, sodium bicarbonate