from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Silica.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A hard glassy mineral, SiO₂, occurring as quartz, sand, opal etc. Informally known as silica.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- 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
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