silica
a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite • Syn: silicon oxide, silicon dioxide • Derivationally related forms: silicious, siliceous • Hypernyms: oxide • Hyponyms: chert, flint, silex • Substance Holonyms: quartz, cristobalite, tridymite, quartz glass, vitreous silica, lechatelierite, crystal
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