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

silica

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