sil·i·ca /ˈsɪlɪkə/ 名詞
Sil·i·ca n. Chem. Silicon dioxide, SiO░. It constitutes ordinary quartz (also opal and tridymite), and is artifically prepared as a very fine, white, tasteless, inodorous powder.
n : 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 [syn: silicon
oxide, silicon dioxide]