Source : Webster's Revised Unabridged Dictionary (1913)

Sal \Sal\ (s[a^]l), n. [L. See {Salt}.] (Chem. & Pharm.)
   Salt.

   {Sal absinthii} [NL.] (Old Chem.), an impure potassium
      carbonate obtained from the ashes of wormwood ({Artemisia
      Absinthium}).

   {Sal acetosell[ae]} [NL.] (Old Chem.), salt of sorrel.

   {Sal alembroth}. (Old Chem.) See {Alembroth}.

   {Sal ammoniac} (Chem.), ammonium chloride, {NH4Cl}, a white
      crystalline volatile substance having a sharp salty taste,
      obtained from gas works, from nitrogenous matter, etc. It
      is largely employed as a source of ammonia, as a reagent,
      and as an expectorant in bronchitis. So called because
      originally made from the soot from camel's dung at the
      temple of Jupiter Ammon in Africa. Called also {muriate of
      ammonia}.

   {Sal catharticus} [NL.] (Old Med. Chem.), Epsom salts.

   {Sal culinarius} [L.] (Old Chem.), common salt, or sodium
      chloride.

   {Sal Cyrenaicus}. [NL.] (Old Chem.) See {Sal ammoniac} above.
      

   {Sal de duobus}, {Sal duplicatum} [NL.] (Old Chem.),
      potassium sulphate; -- so called because erroneously
      supposed to be composed of two salts, one acid and one
      alkaline.

   {Sal diureticus} [NL.] (Old Med. Chem.), potassium acetate.
      

   {Sal enixum} [NL.] (Old Chem.), acid potassium sulphate.

   {Sal gemm[ae]} [NL.] (Old Min.), common salt occuring native.
      

   {Sal Jovis} [NL.] (Old Chem.), salt tin, or stannic chloride;
      -- the alchemical name of tin being Jove.

   {Sal Martis} [NL.] (Old Chem.), green vitriol, or ferrous
      sulphate; -- the alchemical name of iron being Mars.

   {Sal microcosmicum} [NL.] (Old Chem.) See {Microcosmic salt},
      under {Microcosmic}.

   {Sal plumbi} [NL.] (Old Chem.), sugar of lead.

   {Sal prunella}. (Old Chem.) See {Prunella salt}, under 1st
      {Prunella}.

   {Sal Saturni} [NL.] (Old Chem.), sugar of lead, or lead
      acetate; -- the alchemical name of lead being Saturn.

   {Sal sedativus} [NL.] (Old Chem.), sedative salt, or boric
      acid.

   {Sal Seignette} [F. seignette, sel de seignette] (Chem.),
      Rochelle salt.

   {Sal soda} (Chem.), sodium carbonate. See under {Sodium}.

   {Sal vitrioli} [NL.] (Old Chem.), white vitriol; zinc
      sulphate.

   {Sal volatile}. [NL.]
   (a) (Chem.) See {Sal ammoniac}, above.
   (b) Spirits of ammonia.

Soda \So"da\, n. [It., soda, in OIt., ashes used in making
   glass, fr. L. solida, fem. of solidus solid; solida having
   probably been a name of glasswort. See {Solid}.] (Chem.)
   (a) Sodium oxide or hydroxide.
   (b) Popularly, sodium carbonate or bicarbonate.

   {Caustic soda}, sodium hydroxide.

   {Cooking soda}, sodium bicarbonate. [Colloq.]

   {Sal soda}. See {Sodium carbonate}, under {Sodium}.

   {Soda alum} (Min.), a mineral consisting of the hydrous
      sulphate of alumina and soda.

   {Soda ash}, crude sodium carbonate; -- so called because
      formerly obtained from the ashes of sea plants and certain
      other plants, as saltwort ({Salsola}). See under {Sodium}.
      

   {Soda fountain}, an apparatus for drawing soda water, fitted
      with delivery tube, faucets, etc.

   {Soda lye}, a lye consisting essentially of a solution of
      sodium hydroxide, used in soap making.

   {Soda niter}. See {Nitratine}.

   {Soda salts}, salts having sodium for the base; specifically,
      sodium sulphate or Glauber's salts.

   {Soda waste}, the waste material, consisting chiefly of
      calcium hydroxide and sulphide, which accumulates as a
      useless residue or side product in the ordinary Leblanc
      process of soda manufacture; -- called also {alkali
      waste}.

   {Soda water}, originally, a beverage consisting of a weak
      solution of sodium bicarbonate, with some acid to cause
      effervescence; now, in common usage, a beverage consisting
      of water highly charged with carbon dioxide (carbonic
      acid). Fruit sirups, cream, etc., are usually added to
      give flavor. See {Carbonic acid}, under {Carbonic}.

   {Washing soda}, sodium carbonate. [Colloq.]

Source : WordNet®

sal soda
     n : a sodium salt of carbonic acid; used in making soap powders
         and glass and paper [syn: {sodium carbonate}, {washing
         soda}, {soda ash}, {soda}]