silicon dioxide

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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:
silica, silicon oxide
• Derivationally related forms:
silicious (for: silica), siliceous (for: silica)
• Hypernyms:
oxide
• Hyponyms:
chert, flint, silex
• Substance Holonyms:
quartz, cristobalite, tridymite, quartz glass, vitreous silica,
lechatelierite, crystal