Main Entry: glass

Pronunciation: \ˈglas\

Function: noun

Usage: often attrib

1 a : an amorphous inorganic usually transparent or translucent substance consisting of a mixture of silicates or sometimes borates or phosphates formed by fusion of silica or of oxides of boron or phosphorus with a flux and a stabilizer into a mass that cools to a rigid condition without crystallization b : a substance resembling glass especially in hardness and transparency <organic glasses made from plastics>
2 a : an optical instrument or device that has one or more lenses and is designed to aid in the viewing of objects not readily seen b glasses pl : a device used to correct defects of vision or to protect the eyes that consists typically of a pair of glass or plastic lenses and the frame by which they are held in place—called also eyeglasses