[1] : The Collaborative International Dictionary of English v.0.48

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.
   1. chem.
      a sodium oxide or hydroxide.
      b popularly, sodium carbonate or bicarbonate. sodium
          bicarbonate is also called baking soda
          1913 webster

   2. same as sodium, used in terms such as bicarbonate of
      soda.
      pjc

   3. same as soda water.
      pjc

   4. a non-alcoholic beverage, sweetened by various means,
      containing flavoring and supersaturated with carbon
      dioxide, so as to be effervescent when the container is
      opened; -- in different localities it is variously called
      also soda pop, pop, mineral water, and minerals.
      it has many variants. the sweetening agent may be natural,
      such as cane sugar or corn syrup, or artificial, such as
      saccharin or aspartame. the flavoring varies widely,
      popular variants being fruit or cola flavoring.
      pjc

   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.

   washing soda, sodium carbonate. colloq.
      1913 webster
see also:
solid baking soda sodium bicarbonate of soda soda water soda pop 
pop mineral water minerals caustic soda cooking soda 
sal soda sodium carbonate sodium soda alum soda ash 
salsola soda fountain soda lye soda niter nitratine 
soda salts soda waste alkali waste washing soda 

[2] : The Collaborative International Dictionary of English v.0.48

sodium \so"dium\, n. nl., fr.e. soda. chem.
   a common metallic element of the alkali group, in nature
   always occuring combined, as in common salt, in albite, etc.
   it is isolated as a soft, waxy, white, unstable metal, so
   highly reactive that it combines violently with water, and to
   be preserved must be kept under petroleum or some similar
   liquid. sodium is used combined in many salts, in the free
   state as a reducer, and as a means of obtaining other metals
   as magnesium and aluminium is an important commercial
   product. symbol na natrium. atomic weight 22.990.
   specific gravity 0.97.
   1913 webster

   sodium amalgam, an alloy of sodium and mercury, usually
      produced as a gray metallic crystalline substance, which
      is used as a reducing agent, and otherwise.

   sodium carbonate, a white crystalline substance,
      na2co3.10h2o, having a cooling alkaline taste, found in
      the ashes of many plants, and produced artifically in
      large quantities from common salt. it is used in making
      soap, glass, paper, etc., and as alkaline agent in many
      chemical industries. called also sal soda, washing
      soda, or soda. cf. sodium bicarbonate, and trona.
      

   sodium chloride, common, or table, salt, nacl.

   sodium hydroxide, a white opaque brittle solid, naoh,
      having a fibrous structure, produced by the action of
      quicklime, or of calcium hydrate milk of lime, on sodium
      carbonate. it is a strong alkali, and is used in the
      manufacture of soap, in making wood pulp for paper, etc.
      called also sodium hydrate, and caustic soda. by
      extension, a solution of sodium hydroxide.
      1913 webster
see also:
natrium sodium amalgam sodium carbonate na2co3.10h2o sal soda washing soda 
soda sodium bicarbonate trona sodium chloride nacl 
sodium hydroxide naoh sodium hydrate caustic soda 

[3] : The Collaborative International Dictionary of English v.0.48

caustic \caus"tic\, caustical \caus"tical\, a. l. caustucs,
   ge. ?, fr. ? to burn. cf. calm, ink.
   1. capable of destroying the texture of anything or eating
      away its substance by chemical action; burning; corrosive;
      searing.
      1913 webster

   2. severe; satirical; sharp; as, a caustic remark.
      1913 webster

   caustic curve optics, a curve to which the ray of light,
      reflected or refracted by another curve, are tangents, the
      reflecting or refracting curve and the luminous point
      being in one plane.

   caustic lime. see under lime.

   caustic potash, caustic soda chem., the solid
      hydroxides potash, koh, and soda, naoh, or solutions
      of the same.

   caustic silver, nitrate of silver, lunar caustic.

   caustic surface optics, a surface to which rays reflected
      or refracted by another surface are tangents. caustic
      curves and surfaces are called catacaustic when formed by
      reflection, and diacaustic when formed by refraction.

   syn: stinging; cutting; pungent; searching.
        1913 webster
see also:
calm ink caustic curve caustic lime lime caustic potash 
caustic soda koh naoh caustic silver caustic surface 

[4] : WordNet (r) 2.0

caustic soda
     n : a strongly alkaline caustic used in manufacturing soap and
         paper and aluminum and various sodium compounds syn: sodium
         hydroxide
see also:
sodium hydroxide 

Caustic Soda >> C Words
Caustic Soda, definition of term: Caustic Soda
caustic+soda_pag1.html

Soda >> S Words
Soda, definition of term: Soda
soda_pag1.html

Caustic >> C Words
Caustic, definition of term: Caustic
caustic_pag1.html

Soda Ash >> S Words
Soda Ash, definition of term: Soda Ash
soda+ash_pag1.html

Soda Pop >> S Words
Soda Pop, definition of term: Soda Pop
soda+pop_pag1.html

Caustic Potash >> C Words
Caustic Potash, definition of term: Caustic Potash
caustic+potash_pag1.html

Washing Soda >> W Words
Washing Soda, definition of term: Washing Soda
washing+soda_pag1.html

Lunar Caustic >> L Words
Lunar Caustic, definition of term: Lunar Caustic
lunar+caustic_pag1.html

Baking Soda >> B Words
Baking Soda, definition of term: Baking Soda
baking+soda_pag1.html