Source : Webster's Revised Unabridged Dictionary (1913)

Potassium \Po*tas"si*um\, n. [NL. See {Potassa}, {Potash}.]
   (Chem.)
   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).

   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.

   {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
      manganate.

   {Potassium bitartrate}. See {Cream of tartar}, under {Cream}.

Chameleon \Cha*me"le*on\ (k[.a]*m[=e]"l[-e]*[u^]n), n. [L.
   Chamaeleon, Gr. chamaile`wn, lit., ``ground lion;'' chamai`
   on the ground + le`wn lion. See {Humble}, and {Lion}.]
   (Zo["o]l.)
   A lizardlike reptile of the genus {Cham[ae]leo}, of several
   species, found in Africa, Asia, and Europe. The skin is
   covered with fine granulations; the tail is prehensile, and
   the body is much compressed laterally, giving it a high back.

   Note: Its color changes more or less with the color of the
         objects about it, or with its temper when disturbed. In
         a cool, dark place it is nearly white, or grayish; on
         admitting the light, it changes to brown, bottle-green,
         or blood red, of various shades, and more or less
         mottled in arrangment. The American chameleons belong
         to {Anolis} and allied genera of the family
         {Iguanid[ae]}. They are more slender in form than the
         true chameleons, but have the same power of changing
         their colors.

   {Chameleon mineral} (Chem.), the compound called {potassium
      permanganate}, a dark violet, crystalline substance,
      {KMnO4}, which in formation passes through a peculiar
      succession of color from green to blue, purple, red, etc.
      See {Potassium permanganate}, under {Potassium}.