Medical Definition of glass
1a: 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 crystallizationb: a substance resembling glass especially in hardness and transparency <organic glasses made from plastics>
2a: an optical instrument or device that has one or more lenses and is designed to aid in the viewing of objects not readily seenbglasses 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
Learn More about glass
Seen and Heard
What made you want to look up glass? Please tell us where you read or heard it (including the quote, if possible).