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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   atomic number 14
       n 1: a tetravalent nonmetallic element; next to oxygen it is the
            most abundant element in the earth's crust; occurs in clay
            and feldspar and granite and quartz and sand; used as a
            semiconductor in transistors [syn: silicon, Si, atomic
    number 14]