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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二氧化硅
    Word Originearly 19th cent.: from Latin silex, silic- ‘flint’, on the pattern of words such as alumina.