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English Dictionary: atomic number 20 by the DICT Development Group
1 result for atomic number 20
From WordNet (r) 3.0 (2006) [wn]:
atomic number 20
n
  1. a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals
    Synonym(s): calcium, Ca, atomic number 20
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