Silica

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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.
     [1913 Webster]



From WordNet (r) 2.0 [wn]:

  silica
       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}]