D defs.my
Entry 3 senses Webster, 1913

Opera

/(ŏp"ẽr*ȧ)/ · Op·er·a · IPA /ˈɑp.ə.ɹə/
01 n. A drama, either tragic or comic, of which music forms an essential part; a drama wholly or mostly sung, consisting of recitative, arias, ch…
  1. 1.
    A drama, either tragic or comic, of which music forms an essential part; a drama wholly or mostly sung, consisting of recitative, arias, choruses, duets, trios, etc., with orchestral accompaniment, preludes, and interludes, together with appropriate costumes, scenery, and action; a lyric drama.
  2. 2.
    The score of a musical drama, either written or in print; a play set to music.
  3. 3.
    The house where operas are exhibited.
Phrases & compounds
Opera bouffe — light, farcical, burlesque opera.
Opera box — a partially inclosed portion of the auditorium of an opera house for the use of a small private party.
Opera comique — comic or humorous opera.
Opera flannel — a light flannel, highly finished.
Opera girl — an East Indian plant (Mantisia saltatoria) of the Ginger family, sometimes seen in hothouses. It has curious flowers which have some resemblance to a ballet dancer, whence the popular name. Called also dancing girls.
Opera glass — a short telescope with concave eye lenses of low power, usually made double, that is, with a tube and set of glasses for each eye; a lorgnette; -- so called because adapted for use at the opera, theater, etc.
Opera hat — a gentleman's folding hat.
Opera house — specifically, a theater devoted to the performance of operas.
Opera seria — serious or tragic opera; grand opera.