Webster's English Dictionary

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silicon

Cross references:
  1. element               
 
sil.i.con \'sil-i-k*n, 'sil-*-.ka:n\ n [NL silica + E -on (as in carbon)] : 
   a tetravalent nonmetallic element that occurs combined as the most abund 
   ant element next to oxygen in the earth's crust and is used esp. in alloys