Webster's Dictionary, 1913

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Open sea (Internat. Law) A sea open to all nations. See Mare clausum .

Open verdict (Law) A verdict on a preliminary investigation, finding the fact of a crime but not stating the criminal, or finding the fact of a violent death without disclosing the cause.

Open-air adjective Taking place in the open air; outdoor; as, an open-air game or meeting.

Open-eyed adjective With eyes widely open; watchful; vigilant. Shak.

Open-handed adjective Generous; liberal; munificent. -- O"pen-hand`ed*ness , noun J. S. Mill.

Open-headed adjective Bareheaded. [ Obsolete]

Open-hearted adjective Candid; frank; generous. Dryden. -- O"pen-heart`ed*ly , adverb -- O"pen-heart`ed*ness , noun Walton.

Open-hearth steel See under Open .

Open-mouthed adjective Having the mouth open; gaping; hence, greedy; clamorous. L'Estrange.

Openbill noun (Zoology) A bird of the genus Anastomus , allied to the stork; -- so called because the two parts of the bill touch only at the base and tip. One species inhabits India, another Africa. Called also open- beak . See Illust. (m) , under Beak .

Opener noun One who, or that which, opens. "True opener of my eyes." Milton.

Opening noun
1. The act or process of opening; a beginning; commencement; first appearance; as, the opening of a speech.

The opening of your glory was like that of light.

2. A place which is open; a breach; an aperture; a gap; cleft, or hole.

We saw him at the opening of his tent.

3. Hence: A vacant place; an opportunity; as, an opening for business. [ Colloq.] Dickens.

4. A thinly wooded space, without undergrowth, in the midst of a forest; as, oak openings . [ U.S.] Cooper.

Openly adverb [ Anglo-Saxon openlice .]
1. In an open manner; publicly; not in private; without secrecy.

How grossly and openly do many of us contradict the precepts of the gospel by our ungodliness!

2. Without reserve or disguise; plainly; evidently.

My love . . . shall show itself more openly .

Openness noun The quality or state of being open.

Openwork noun
1. Anything so constructed or manufactured (in needlework, carpentry, metal work, etc.) as to show openings through its substance; work that is perforated or pierced.

2. (Mining) A quarry; an open cut. Raymond.

Oper*atic, Operatical adjective Of or pertaining to the opera or to operas; characteristic of, or resembling, the opera.

Opera noun [ Italian , from opera work, composition, opposed to an improvisation, from Latin opera pains work, from opus , operis , work, labor: confer French opéra . See Operate .]
1. A drama, either tragic or comic, of which music forms an essential part; a drama wholly or mostly sung, consisting of recitative, arials, choruses, duets, trios, etc., with orchestral accompaniment, preludes, and interludes, together with appropriate costumes, scenery, and action; a lyric drama.

2. The score of a musical drama, either written or in print; a play set to music.

3. The house where operas are exhibited.

Operable adjective Practicable. [ Obsolete]

Operameter noun [ Latin opus , operis , plural opera work + -meter .] 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.

Operance, Operancy noun The act of operating or working; operation. [ R.]

Operand noun [ From neuter of Latin operandus , gerundive of operari . See Operate .] (Math.) The symbol, quantity, or thing upon which a mathematical operation is performed; -- called also faciend .

Operant adjective [ Latin operans , present participle of operari . See Operate .] Operative. [ R.] Shak. -- noun An operative person or thing. [ R.] Coleridge.

Operate intransitive verb [ imperfect & past participle Operated ; present participle & verbal noun Operating .] [ Latin operatus , past participle of operari to work, from opus , operis , work, labor; akin to Sanskrit apas , and also to German üben to exercise, Old High German uoben , Icelandic ...fa . Confer Inure , Maneuver , Ure .]
1. To perform a work or labor; to exert power or strengh, physical or mechanical; to act.

2. To produce an appropriate physical effect; to issue in the result designed by nature; especially (Medicine) , to take appropriate effect on the human system.

3. To act or produce effect on the mind; to exert moral power or influence.

The virtues of private persons operate but on a few.

A plain, convincing reason operates on the mind both of a learned and ignorant hearer as long as they live.

4. (Surg.) To perform some manual act upon a human body in a methodical manner, and usually with instruments, with a view to restore soundness or health, as in amputation, lithotomy, etc.

5. To deal in stocks or any commodity with a view to speculative profits. [ Brokers' Cant]

Operate transitive verb
1. To produce, as an effect; to cause.

The same cause would operate a diminution of the value of stock.
A. Hamilton.

2. To put into, or to continue in, operation or activity; to work; as, to operate a machine.

Operation noun [ Latin operatio : confer French opération .]
1. 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.

Speculative painting, without the assistance of manual operation , can never attain to perfection.

2. The method of working; mode of action.

3. That which is operated or accomplished; an effect brought about in accordance with a definite plan; as, military or naval operations .

4. Effect produced; influence. [ Obsolete]

The bards . . . had great operation on the vulgar.

5. (Math.) Something to be done; some transformation to be made upon quantities, the transformation being indicated either by rules or symbols.

6. (Surg.) Any methodical action of the hand, or of the hand with instruments, on the human body, to produce a curative or remedial effect, as in amputation, etc.

Calculus of operations . See under Calculus .

Operative adjective [ Confer L. operativus , French opératif .]
1. Having the power of acting; hence, exerting force, physical or moral; active in the production of effects; as, an operative motive.

It holds in all operative principles.

2. Producing the appropriate or designed effect; efficacious; as, an operative dose, rule, or penalty.

3. (Surg.) Based upon, or consisting of, an operation or operations; as, operative surgery.

Operative noun A skilled worker; an artisan; esp., one who operates a machine in a mill or manufactory.

Operatively adverb In an operative manner.

Operator noun [ Latin ]
1. One who, or that which, operates or produces an effect.

2. (Surg.) One who performs some act upon the human body by means of the hand, or with instruments.

3. A dealer in stocks or any commodity for speculative purposes; a speculator. [ Brokers' Cant]

4. (Math.) The symbol that expresses the operation to be performed; -- called also facient .

Operatory noun A laboratory. [ Obsolete]

Opercle noun [ Confer F. opercule . See Operculum .]
1. (Anat.) Any one of the bony plates which support the gill covers of fishes; an opercular bone.

2. (Zoology) An operculum.

Opercula noun plural See Operculum .

Opercular adjective Of, pertaining to, or like, an operculum.

Opercular noun (Anat.) The principal opercular bone or operculum of fishes.

Operculate, Operculated adjective [ Latin operculatus , past participle of operculare to furnish with a lid, from operculum lid.]
1. (Botany) Closed by a lid or cover, as the capsules of the mosses.

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

Operculiferous adjective [ Operculum + -ferous .] (Zoology) Bearing an operculum.

Operculiform adjective [ Latin operculum a cover + -form : confer French operculiforme .] Having the form of a lid or cover.

Operculigenous adjective [ Operculum + -genous .] (Zoology) Producing an operculum; -- said of the foot, or part of the foot, of certain mollusks.

Operculum noun ; plural Latin Opercula , English Operculums . [ Latin , a cover or lid, from operire to cover.]
1. (Botany) (a) The lid of a pitcherform leaf. (b) The lid of the urnlike capsule of mosses.

2. (Anat.) (a) Any lidlike or operculiform process or part; as, the opercula of a dental follicle. (b) The fold of integument, usually supported by bony plates, which protects the gills of most fishes and some amphibians; the gill cover; the gill lid. (c) The principal opercular bone in the upper and posterior part of the gill cover.

3. (Zoology) (a) The lid closing the aperture of various species of shells, as the common whelk. See Illust. of Gastropoda . (b) Any lid-shaped structure closing the aperture of a tube or shell.

Operetta noun [ Italian , dim. of opera .] (Mus.) A short, light, musical drama.

Operose adjective [ Latin operosus , from opera pains, labor, opus , operis , work, labor.] Wrought with labor; requiring labor; hence, tedious; wearisome. " Operose proceeding." Burke. "A very operose calculation." De Quincey. -- Op"er*ose`ly , adverb -- Op"er*ose`ness , noun

Operosity noun [ Latin operositas .] Laboriousness. [ R.] Bp. Hall.

Operous adjective Operose. [ Obsolete] Holder. -- Op"er*ous*ly , adverb [ Obsolete]

Opertaneous adjective [ Latin opertaneus ; operire to hide.] Concealed; private. [ R.]

Opetide noun [ Ope + tide .] Open time; -- applied to different things : (a) The early spring, or the time when flowers begin opening. [ Archaic] Nares. (b) The time between Epiphany and Ash Wednesday wherein marriages were formerly solemnized publicly in churches. [ Eng.] (c) The time after harvest when the common fields are open to all kinds of stock. [ Prov.Eng.] Halliwell. [ Written also opentide .]

Ophelic adjective (Chemistry) Of, pertaining to, or designating, a substance (called ophelic acid ) extracted from a plant ( Ophelia ) of the Gentian family as a bitter yellowish sirup, used in India as a febrifuge and tonic.

Ophicleide noun [ French ophicléide , from Greek 'o`fis a serpent + ..., gen. ..., a key. So named because it was in effect the serpent, an old musical instrument, with keys added.] (Mus.) A large brass wind instrument, formerly used in the orchestra and in military bands, having a loud tone, deep pitch, and a compass of three octaves; -- now generally supplanted by bass and contrabass tubas. Moore (Encyc. of Music).

Ophidia noun plural [ New Latin , from Greek ..., dim. of 'o`fis a snake.] (Zoology) The order of reptiles which includes the serpents.

» The most important divisions are: the Solenoglypha , having erectile perforated fangs, as the rattlesnake; the Proteroglypha , or elapine serpents, having permanently erect fang, as the cobra; the Asinea , or colubrine serpents, which are destitute of fangs; and the Opoterodonta , or Epanodonta , blindworms, in which the mouth is not dilatable.

Ophidian noun [ Confer French ophidien .] (Zoology) One of the Ophidia; a snake or serpent.

Ophidian adjective [ Confer French ophidien .] (Zoology) Of or pertaining to the Ophidia; belonging to serpents.