silica
1. [ noun ] (chemistry,geology) a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechartelierite
Synonyms: silicon_dioxide silicon_oxide
Related terms: oxide flint silex chert tridymite lechartelierite quartz cristobalite
Similar spelling:   Sillago
  siliqua
  sills
  Silis
  Silas
  Sialis