Hypertext Webster Gateway: "silica"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (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}]
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