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1 definition found
 for atomic number 15
From WordNet (r) 3.0 (2006) :

  atomic number 15
      n 1: a multivalent nonmetallic element of the nitrogen family
           that occurs commonly in inorganic phosphate rocks and as
           organic phosphates in all living cells; is highly reactive
           and occurs in several allotropic forms [syn: phosphorus,
           P, atomic number 15]

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