ground glass
From Longman Dictionary of Contemporary EnglishRelated topics: Industryground glassˌground ˈglass noun [uncountable] 1 TIglass that has been made into a powder2 TIglass that has been rubbed on its surface so that you cannot see through it, but light passes through it – used for example on a cameraExamples from the Corpusground glass• Some had cigarette butts, ground glass and bits of cloth glued to their inside surfaces.• 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.