silica

2 definitions found

silica - Collaborative International Dictionary of English v.0.48 :

  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]

silica - WordNet (r) 2.1 (2005) :

  silica
      n 1: 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, silicon dioxide]