ground glass

ground glass

noun
1.
Optics. glass that has had its polished surface removed by fine grinding and that is used to diffuse light.
2.
glass that has been ground into fine particles, especially for use as an abrasive.

Origin:
1840–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ground glass
 
n
1.  glass that has a rough surface produced by grinding, used for diffusing light
2.  glass in the form of fine particles produced by grinding, used as an abrasive

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