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18.223.195.127
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1 definition found

From: WordNet (r) 2.0

 atomic number 19
      n : a light soft silver-white metallic element of the alkali
          metal group; oxidizes rapidly in air and reacts violently
          with water; is abundant in nature in combined forms
          occurring in sea water and in carnallite and kainite and
          sylvite [syn: potassium, K]