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1 definition found
 for atomic number 9
From WordNet (r) 3.0 (2006) :

  atomic number 9
      n 1: a nonmetallic univalent element belonging to the halogens;
           usually a yellow irritating toxic flammable gas; a powerful
           oxidizing agent; recovered from fluorite or cryolite or
           fluorapatite [syn: fluorine, F, atomic number 9]

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