silicon-dioxide

silicon dioxide

noun Chemistry.
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silica

[sil-i-kuh]
noun
the dioxide form of silicon, SiO 2 , occurring especially as quartz sand, flint, and agate: used usually in the form of its prepared white powder chiefly in the manufacture of glass, water glass, ceramics, and abrasives.
Also called silicon dioxide.


Origin:
1795–1805; < Neo-Latin, derivative of Latin silex silex

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World English Dictionary
silica (ˈsɪlɪkə)
 
n
1.  the dioxide of silicon, occurring naturally as quartz, cristobalite, and tridymite. It is a refractory insoluble material used in the manufacture of glass, ceramics, and abrasives
2.  short for silica glass
 
[C19: New Latin, from Latin: silex]

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Etymonline
Word Origin & History

silica
"hard silicon dioxide," 1801, Mod.L., from L. silex (gen. silicis) "flint, pebble."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

silica sil·i·ca (sĭl'ĭ-kə)
n.
A crystalline compound occurring abundantly as quartz, sand, and many other minerals and used to manufacture a variety of materials, especially glass and concrete.

silicon dioxide n.
Silica.

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American Heritage
Science Dictionary
silica   (sĭl'ĭ-kə)  Pronunciation Key 
A chemical compound that is the main constituent of most of the Earth's rocks. Silica occurs naturally in five crystalline forms (quartz, tridymite, cristobalite, coesite, and stishovite), in a cryptocrystalline form (chalcedony), and in an amorphous form (opal). It is also the main chemical compound in sand. Silica is used to make glass, concrete, and other materials. Also called silicon dioxide. Chemical formula: SiO2.
silicon dioxide  
See silica.
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