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silicon dioxide > noun, substance
MeaningA white or colorless vitreous insoluble solid (SiO2). Various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechartelierite.
Synonymssilica, silicon oxide
Substance ofcristobalite; lechartelierite; quartz; tridymite
Broaderoxide
Narrowerchert; flint; silex

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