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Webster 1913 Edition

Silica

Sil′i-ca

,
Noun.
[NL., from L.
silex
,
silics
, a flint.]
(Chem.)
Silicon dioxide, SiO[GREEK]. It constitutes ordinary quartz (also opal and tridymite), and is artifically prepared as a very fine, white, tasteless, inodorous powder.

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