A white soluble compound used in effervescent drinks and in baking powders and as an antacid; SYN. sodium bicarbonate, baking soda, saleratus.
Or baking soda (technical name sodium hydrogencarbonate) NaHCO3 white crystalline solid that neutralizes acids and is used in medicine to treat acid indigestion. It is also used in baking powders and effervescent drinks.
ETYM Italian, soda, in OIt., ashes used in making glass, from Latin solida, fem. of solidus solid; solida having probably been a name of glasswort. Related to Solid.