A theatre, or similar building, primarily used for staging opera.

plural of opera glass

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

A pair of small low-powered binoculars for use at a theatrical performance.

plural of magnum opus

A type of French comic opera, typified by everyday characters and ludicrous situations. (Often attributive.)

plural of opera hat

A kind of collapsible top hat.

(music) A form of traditional Chinese theatre which combines music, vocal performance, mime, dance and acrobatics.

plural of opera window