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ground glasses

 - 1 dictionary result

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, esp. for use as an abrasive.

Origin:
1840–50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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