plural of opera glass

One or more pairs of small low-powered binoculars for use by members of the audience at a theatrical performance.

(chemistry) A solution of sodium silicate in water.

A vessel of about 30ml volume, used for the measurement of spirituous liquors.

(horticulture, literally) In a greenhouse, a cold frame, or a similar structure; said of the propagation and growth of plants. / In a glass case, like an item in a museum. / (idiomatic, slang) In jail.

A small glass used to hold or measure a small quantity of liquor.

An instrument made of convex glass, used to magnify.

plural of looking glass

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

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