Noun
glass that diffuses light due to a rough surface produced by abrasion or etching
particulate glass made by grinding and used as an abrasive
Source: WordNetground-glass
He who lives by the crystal ball soon learns to eat ground glass. Edgar Fiedler
It had rained on some vivid green ferns in Maine and it was quite beautiful. I was moving the camera slightly and studying the ground glass. Looking at those 20 square inches, trying to find out just what were the right elements to include. John Sexton
Alternatively, the neck may be fitted with ground glass or other connector for use with more specialized stoppers or attachment to other apparatus. Source: Internet
Although silicone grease used as a sealant and a lubricant for interconnecting ground glass joints is normally assumed to be chemically inert, some compounds have resulted from unintended reactions with silicones. Source: Internet
Early models used ground glass which was sometimes tinted around the wick. Source: Internet
In addition to the ground glass, a simple optical viewfinder was often fitted. Source: Internet