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Silica

Noun

sil=ic=a

WORDNET DICTIONARY

silica(n = noun.substance) silicon dioxide, silicon oxide - 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; Array

has particulars: chert, flint, silex

is a kind of oxide

Derived forms adjective siliceous₁, adjective silicious₁

Silica, n. [NL., from L. silex, silics, a flint.].

Silicon dioxide, SiO1913 Webster]

Silica, n. silicon dioxide, occurring as quartz etc. and as a principal constituent of sandstone and other rocks.

Idiom

silica gel hydrated silica in a hard granular form used as a desiccant.

Derivative

siliceous adj. (also silicious). silicic adj. silicify v.tr. & intr. (-ies, -ied). silicification n.

Etymology

L silex -icis flint, after alumina etc.

For further exploring for "Silica" in Webster Dictionary Online