A slightly convex mirror, commonly of black glass, once used by artists to view landscapes and produce works similar to those of Claude Lorrain.

(dated) Synonym of mirror (“smooth surface that reflects light so as to give an image of what is in front of it”).

An aircraft cockpit with its avionics displayed on computer screens, rather than on gauges.

In amorphous materials, gradual and reversible transition from a hard and relatively brittle "glassy" state into a viscous or rubbery state (or opposite) over a range of temperature range.

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

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

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

Any type of glass, such as toughened glass, laminated glass or wire mesh glass, with additional safety features that make it less likely to break, or less likely to pose a threat when broken.

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

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