From Longman Dictionary of Contemporary Englishground 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 camera
Examples from the Corpus
ground 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. 