Saleratus

saleratus
    n 1: a white soluble compound (NaHCO3) used in effervescent
         drinks and in baking powders and as an antacid [syn:
         {bicarbonate of soda}, {sodium hydrogen carbonate}, {sodium
         bicarbonate}, {baking soda}, {saleratus}]
    

Saleratus \Sal`e*ra"tus\, n. [NL. sal a["e]ratus; -- so called
   because it is a source of fixed air (carbon dioxide). See
   {Sal}, and and {Aerated}.] (Old Chem.)
   Aerated salt; a white crystalline substance having an
   alkaline taste and reaction, consisting of sodium bicarbonate
   (see under {Sodium}.) It is largely used in cooking, with
   sour milk (lactic acid) or cream of tartar as a substitute
   for yeast. It is also an ingredient of most baking powders,
   and is used in the preparation of effervescing drinks.
   [1913 Webster]
    

Sodium bicarbonate \Sodium bicarbonate\,
   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.
   [1913 Webster]