A spyglass or binoculars with large diameter lenses, used to see objects better in the dark.

(historical) An eyeglass with or without a handle; a monocle.

(chemistry, physics) Any of several electrodes, having a thin glass bulb, whose potential is dependent upon the concentration of hydrogen or other ions in the solution in which it is immersed; used in pH meters etc.

Glass that has been coloured, either by painting or by fusing pigments into its structure. / (architecture) The use of such glass to construct decorative windows, especially in churches.

(physics) Any material in which the atomic spins are oriented at disordered but fixed directions

A tall narrow mirror, usually set between two windows, above a pier table.

A field glass used at horseraces, usually as a pair (binoculars).

(inorganic chemistry) Any of several inorganic polymers of sulphur, selenium and tellurium, that are transparent to infrared radiation and are used in optics.

A heat-resistant glass made with the addition of boric oxide.

A long mirror, mounted on a swivel in a frame, allowing it to be tilted.