Noun Concept
Categories: Chemical elements, Group IV semiconductors, Pyrotechnic fuels, Crystals in space group 206, Materials that expand upon freezing
silicon  Si  atomic number 14  14Si  Biological roles of silicon
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 WordNet 3.0
Silicon is a chemical element with the symbol Si and atomic number 14. Wikipedia
Chemical element with symbol Si and atomic number 14. Wikipedia Disambiguation
A brittle metalloid element with symbol Si and atomic number 14 that exists in two allotropic forms; occurs principally in sand, quartz, granite, feldspar, and clay. It is usually a grey crystalline solid but is also found as a brown amorphous powder. It is used in transistors, rectifiers, solar cells, and alloys. Its compounds are widely used in glass manufacture, the building industry, and in the form of silicones. OmegaWiki
A nonmetallic element (symbol Si) with an atomic number of 14 and atomic weight of 28.0855. Wiktionary