Etymology
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silica (n.)

"hard silicon dioxide," 1801, Modern Latin, from Latin silex (genitive silicis) "flint, pebble," on model of alumina, soda.

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Definitions of silica

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 lechatelierite;
Synonyms: silicon oxide / silicon dioxide
From wordnet.princeton.edu