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Definition of silica noun from the Oxford Advanced Learner's Dictionary

 

silica

 noun
noun
BrE BrE//ˈsɪlɪkə//
 
; NAmE NAmE//ˈsɪlɪkə//
 
[uncountable] (symbol SiO2)
 
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a chemical containing silicon found in sand and in rocks such as quartz, used in making glass and cement Word Origin early 19th cent.: from Latin silex, silic- ‘flint’, on the pattern of words such as alumina.
See the Oxford Advanced American Dictionary entry: silica

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