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The house where operas are exhibited. Opéra bouffe Etym: [F. opéra opera + bouffe comic, It.buffo], Opera buffa Etym: [It.], 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. -- Opéra comique Etym: [F.], comic or humo…

Practicable. [Obs.]

An instrument or machine for measuring work done, especially for ascertaining the number of rotations made by a machine or wheel in manufacturing cloth; a counter. Ure.

The act of operating or working; operation. [R.]

The symbol, quantity, or thing upon which a mathematical operation is performed; -- called also faciend.

Operative. [R.] Shak. -- n.

uce effect on the mind; to exert moral power or influence. The virtues of private persons operate but on a few. Atterbury. A plain, convincing reason operates on the mind both of a learned and ignorant hearer as long as they live. Swift.

Of or pertaining to the opera or to operas; characteristic of, or resembling, the opera.

The act or process of operating; agency; the exertion of power, physical, mechanical, or moral. The pain and sickness caused by manna are the effects of its operation on the stomach. Locke. Speculative painting, without the assistance of manual operation, can never attain to perfection. Dryden.

ng; hence, exerting force, physical or moral; active in the production of effects; as, an operative motive. It holds in all operative principles. South.

In an operative manner.

One who, or that which, operates or produces an effect.

A laboratory. [Obs.]

Any one of the bony plates which support the gill covers of fishes; an opercular bone.

See Operculum.

Of, pertaining to, or like, an operculum.

Having an operculum, or an apparatus for protecting the gills; -- said of shells and of fishes.

Bearing an operculum.

Having the form of a lid or cover.

Producing an operculum; -- said of the foot, or part of the foot, of certain mollusks.