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.

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Origin:
1840–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Ground glass is always a great word to know.

So is bezoar. Does it mean:

a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

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Collins

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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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"The hedge [of hawthorns] formed a type of suite of chapels disappearing under the wall of their flowers heaped as on an altar; under them, the sun placed on the ground a grid of light, as if it had come through a glass window; their fragrance was as smooth and as clearly defined in its form as if I had stood before the Virgin's altar, and the flowers, so ornamented, each distractedly held its dazzling bouquet of stamens, fine and shining ribs of flamboyant style like those which in the church line the ramp of the rood-screen or the mullions of stained-glass windows and which bloomed into the white flesh of strawberry blossoms."

-Marcel Proust