n. 硅石, 二氧化硅

[化] 二氧化硅

[医] 硅石, 二氧化硅

[ 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
<noun.substance>

Silica \Sil"i*ca\, n. [NL., from L. silex, silics, a flint.]
(Chem.)
Silicon dioxide, SiO?. It constitutes ordinary quartz (also
opal and tridymite), and is artifically prepared as a very
fine, white, tasteless, inodorous powder.