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What is "ground glass"

Longman Dictionary of Contemporary English
ground glass
noun
EXAMPLES FROM CORPUS
▪ He thought, considered ground glass for Phillis.
▪ No cream whether made of placenta or the brains of aborted the whole woman foetuses or ground glass will break down cellulite.
▪ Some had cigarette butts, ground glass and bits of cloth glued to their inside surfaces.
The Collaborative International Dictionary
Ground glass

ground \ground\, imp. & p. p. of Grind. [1913 Webster] ground cock, a cock, the plug of which is ground into its seat, as distinguished from a compression cock.
--Knight. Ground glass, glass the transparency of which has been destroyed by having its surface roughened by grinding. -- Ground joint, a close joint made by grinding together two pieces, as of metal with emery and oil, or of glass with fine sand and water.

Wiktionary
ground glass

n. Glass having a rough, flat surface produced by abrasion or etching

WordNet
ground glass

  1. n. glass that diffuses light due to a rough surface produced by abrasion or etching

  2. particulate glass made by grinding and used as an abrasive

Wikipedia
Ground glass

Ground glass is glass whose surface has been ground to produce a flat but rough ( matte) finish.

Ground glass surfaces have many applications, ranging from mere ornamentation on windows and table glassware to scientific uses in optics and laboratory glassware.