silica gel

noun Chemistry.
a highly adsorbent gelatinous form of silica, used chiefly as a dehumidifying and dehydrating agent.

Origin:
1915–20

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World English Dictionary
silica gel
 
n
an amorphous form of silica capable of absorbing large quantities of water: used in drying gases and oils, as a carrier for catalysts and an anticaking agent for cosmetics

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

silica gel

a highly porous, noncrystalline form of silica used to remove moisture from gases and liquids, to thicken liquids, to impart a dull surface to paints and synthetic films, and for other purposes.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Silica gel is a desiccant, and the purpose of a desiccant is to absorb or adsorb gaseous water vapor.
Subsequently all samples are purified by silica gel column chromatography and alumina column chromatography.
The methanol is collected in deionized distilled water and adsorbed on silica gel.
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