ground glass


noun

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

Origin of ground glass

First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for ground glass

ground glass


noun

glass that has a rough surface produced by grinding, used for diffusing light
glass in the form of fine particles produced by grinding, used as an abrasive
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012