sodium bicarbonate

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. See baking soda.

Wiktionary

1. n. chemistry A salt of sodium hydroxide and carbonic acid, NaHCO3.
2. n. This salt used in cooking as a raising agent, as an antacid, a cleaner, etc.

GNU Webster's 1913

1. a white crystalline substance, HNaCO3, with a slight alkaline taste resembling that of sodium carbonate. It is found in many mineral springs and also produced artificially,. It is used in cookery, in baking powders, and as a source of carbonic acid gas (carbon dioxide) for soda water. Called also baking soda, cooking soda, bicarbonate of soda, bicarb, saleratus, and technically, acid sodium carbonate, sodium acid carbonate, primary sodium carbonate, sodium dicarbonate, etc.

WordNet 3.0

1. n. a white soluble compound (NaHCO3) used in effervescent drinks and in baking powders and as an antacid