silica Hear it!

silica definition

sili·ca (sil′i kə)

noun

a glassy, very hard mineral, silicon dioxide, SiO, found in a variety of forms, as in quartz, opal, chalcedony, sand, or chert

Etymology: ModL < L silex, flint: see silex

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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