| NOUN | substance | silicon dioxide, silica, silicon oxide | a white or colorless vitreous insoluble solid (SiO2) |
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| Meaning | 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. | |
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| Synonyms | silica, silicon oxide | |
| Narrower | chert | Variety of silica containing microcrystalline quartz |
| flint | A hard kind of stone | |
| silex | A pure form of finely ground silica | |
| Broader | oxide | Any compound of oxygen with another element or a radical |
| Substance of | cristobalite | A white mineral consisting of silica |
| quartz | A hard glossy mineral consisting of silicon dioxide in crystal form | |
| quartz glass, quartz, vitreous silica, lechatelierite, crystal | colorless glass made of almost pure silica | |
| tridymite | A mineral form of silica | |
| Spanish | dióxido de silicio, óxido de silicio, sílice | |
| Catalan | diòxid de silici, sílice | |
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