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 plural : 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
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