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Definition of silicon noun from the Oxford Advanced American Dictionary

 

silicon

 noun
noun
NAmE//ˈsɪləˌkɑn//
 
, NAmE//ˈsɪləkən//
 
[uncountable] (symbol Si)
 
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a chemical element. Silicon exists as a gray solid or as a brown powder and is found in rocks and sand. It is used in making glass and transistors.
See the Oxford Advanced Learner's Dictionary entry: silicon

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