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3 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Al·ka·li n.; pl. Alkalis or Alkalies
 1. Soda ash; caustic soda, caustic potash, etc.
 2. Chem. One of a class of caustic bases, such as soda, potash, ammonia, and lithia, whose distinguishing peculiarities are solubility in alcohol and water, uniting with oils and fats to form soap, neutralizing and forming salts with acids, turning to brown several vegetable yellows, and changing reddened litmus to blue.
 3. Soluble mineral matter, other than common salt, contained in soils of natural waters. [Western U. S.]
 Fixed alkalies, potash and soda.
 Vegetable alkalies. Same as Alkaloids.
 Volatile alkali, ammonia, so called in distinction from the fixed alkalies.
 

From: WordNet (r) 2.0

 alkali
      n 1: any of various water-soluble compounds capable of turning
           litmus blue and reacting with an acid to form a salt and
           water; "bases include oxides and hydroxides of metals
           and ammonia" [syn: base]
      2: a mixture of soluble salts found in arid soils and some
         bodies of water; detrimental to agriculture
      [also: alkalies (pl)]

From: WordNet (r) 2.0

 alkalies
      See alkali