From The Collaborative International Dictionary of English v.0.48:

Potassium \Po*tas"si*um\, n. [NL. See Potassa, Potash.]
   An Alkali element, occurring abundantly but always combined,
   as in the chloride, sulphate, carbonate, or silicate, in the
   minerals sylvite, kainite, orthoclase, muscovite, etc. Atomic
   weight 39.0. Symbol K (Kalium).
   [1913 Webster]

   Note: It is reduced from the carbonate as a soft white metal,
         lighter than water, which oxidizes with the greatest
         readiness, and, to be preserved, must be kept under
         liquid hydrocarbons, as naphtha or kerosene. Its
         compounds are very important, being used in glass
         making, soap making, in fertilizers, and in many drugs
         and chemicals.
         [1913 Webster]

   Potassium permanganate, the salt KMnO4, crystallizing in
      dark red prisms having a greenish surface color, and
      dissolving in water with a beautiful purple red color; --
      used as an oxidizer and disinfectant. The name {chameleon
      mineral} is applied to this salt and also to potassium

   Potassium bitartrate. See Cream of tartar, under Cream.
      [1913 Webster]
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