Webster's Dictionary, 1913

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Arachnidium noun [ New Latin See Arachnida .] (Zoology) The glandular organ in which the material for the web of spiders is secreted.

Arachnitis noun [ Greek ... + ....] (Medicine) Inflammation of the arachnoid membrane.

Arachnoid adjective [ Greek ... like a cobweb; ... spider, spider's web + ... form.]
1. Resembling a spider's web; cobweblike.

2. (Anat.) Pertaining to a thin membrane of the brain and spinal cord, between the dura mater and pia mater.

3. (Botany) Covered with, or composed of, soft, loose hairs or fibers, so as to resemble a cobweb; cobwebby.

Arachnoid noun
1. (Anat.) The arachnoid membrane.

2. (Zoology) One of the Arachnoidea.

Arachnoidal adjective (Anat.) Pertaining to the arachnoid membrane; arachnoid.

Arachnoidea noun plural [ New Latin ] (Zoology) Same as Arachnida .

Arachnological adjective Of or pertaining to arachnology.

Arachnologist noun One who is versed in, or studies, arachnology.

Arachnology noun [ Greek ... spider + -logy .] The department of zoölogy which treats of spiders and other Arachnida.

Aragonese adjective Of or pertaining to Aragon, in Spain, or to its inhabitants. -- noun sing. & plural A native or natives of Aragon, in Spain.

Aragonite noun [ From Aragon , in Spain.] (Min.) A mineral identical in composition with calcite or carbonate of lime, but differing from it in its crystalline form and some of its physical characters.

Araguato noun [ Native name.] (Zoology) A South American monkey, the ursine howler ( Mycetes ursinus ). See Howler , noun , 2.

Araise transitive verb To raise. [ Obsolete] Shak.

Arak noun Same as Arrack .

Aramaic adjective [ See Aramæan , adjective ] Pertaining to Aram, or to the territory, inhabitants, language, or literature of Syria and Mesopotamia; Aramæan; -- specifically applied to the northern branch of the Semitic family of languages, including Syriac and Chaldee. -- noun The Aramaic language.

Aramaism noun An idiom of the Aramaic.

Aramæan, Aramean adjective [ Latin Aramaeus , Greek ..., from Hebrew Arām , i. e. Highland, a name given to Syria and Mesopotamia.] Of or pertaining to the Syrians and Chaldeans, or to their language; Aramaic. -- noun A native of Aram.

Araneida Ar`a*ne*oid"e*a noun plural [ New Latin ] (Zoology) See Araneina .

Araneidan adjective (Zoology) Of or pertaining to the Araneina or spiders. -- noun One of the Araneina; a spider.

Araneiform adjective [ Latin aranea spider + - form .] (Zoology) Having the form of a spider. Kirby.

Araneina (ȧ*rā`ne*ī"nȧ) noun plural [ New Latin , from Latin aranea spider.] (Zoology) The order of Arachnida that includes the spiders.

» They have mandibles, modified as poison fangs, leglike palpi, simple eyes, abdomen without segments, and spinnerets for spinning a web. They breathe by pulmonary sacs and tracheæ in the abdomen. See Illustration in Appendix.

Araneose (ȧ*rā"ne*ōs`) adjective [ Latin araneosus .] Of the aspect of a spider's web; arachnoid.

Araneous (-ŭs) adjective [ Latin araneosus , from aranea spider, spider's web.] Cobweblike; extremely thin and delicate, like a cobweb; as, the araneous membrane of the eye. See Arachnoid . Derham.

Arango (ȧ*răn"go) noun ; plural Arangoes (-gōz). [ The native name.] A bead of rough carnelian. Arangoes were formerly imported from Bombay for use in the African slave trade. McCulloch.

Arapaima noun [ Prob. native name.] (Zoology) A large fresh-water food fish of South America.

Arara noun [ Native name.] (Zoology) The palm (or great black) cockatoo, of Australia ( Microglossus aterrimus ).

Araroba noun [ Tupi.]
1. Goa powder.

2. A fabaceous tree of Brazil ( Centrolobium robustum ) having handsomely striped wood; -- called also zebrawood .

Aration noun [ Latin aratio , from arare to plow.] Plowing; tillage. [ R.]

Lands are said to be in a state of aration when they are under tillage.

Aratory adjective [ Late Latin aratorius : confer French aratoire .] Contributing to tillage.

Araucaria noun [ Araucania , a territory south of Chili.] (Botany) A genus of tall conifers of the pine family. The species are confined mostly to South America and Australia. The wood cells differ from those of other in having the dots in their lateral surfaces in two or three rows, and the dots of contiguous rows alternating. The seeds are edible.

Araucarian adjective Relating to, or of the nature of, the Araucaria. The earliest conifers in geological history were mostly Araucarian. Dana.

Arbalest, Arbalist noun [ Old French arbaleste , Late Latin arbalista , for Latin arcuballista ; arcus bow + ballista a military engine. See Ballista .] (Antiq.) A crossbow, consisting of a steel bow set in a shaft of wood, furnished with a string and a trigger, and a mechanical device for bending the bow. It served to throw arrows, darts, bullets, etc. [ Written also arbalet and arblast .] Fosbroke.

Arbalester, Arbalister noun [ Old French arblastere , Old French arbalestier . See Arbalest .] A crossbowman. [ Obsolete] Speed.

Arbiter noun [ Latin arbiter ; ar- (for ad ) + the root of betere to go; hence properly, one who comes up to look on.]
1. A person appointed, or chosen, by parties to determine a controversy between them.

» In modern usage, arbitrator is the technical word.

2. Any person who has the power of judging and determining, or ordaining, without control; one whose power of deciding and governing is not limited.

For Jove is arbiter of both to man.

Syn. -- Arbitrator; umpire; director; referee; controller; ruler; governor.

Arbiter transitive verb To act as arbiter between. [ Obsolete]

Arbitrable adjective [ Confer French arbitrable , from Latin arbitrari . See Arbitrate , transitive verb ] Capable of being decided by arbitration; determinable. [ Archaic] Bp. Hall.

Arbitrage noun [ French, from arbiter to give judgment, Latin arbitrari .]
1. Judgment by an arbiter; authoritative determination. [ Archaic]

2. (Com) A traffic in bills of exchange (see Arbitration of Exchange ); also, a traffic in stocks which bear differing values at the same time in different markets.

Arbitral adjective [ Latin arbitralis .] Of or relating to an arbiter or an arbitration. [ R.]

Arbitrament noun [ Late Latin arbitramentum .]
1. Determination; decision; arbitration.

The arbitrament of time.

Gladly at this moment would MacIvor have put their quarrel to personal arbitrament .
Sir W. Scott.

2. The award of arbitrators. Cowell.

Arbitrarily adverb In an arbitrary manner; by will only; despotically; absolutely.

Arbitrariness noun The quality of being arbitrary; despoticalness; tyranny. Bp. Hall.

Arbitrarious adjective [ Latin arbitrarius . See Arbitrary .] Arbitrary; despotic. [ Obsolete] -- Ar`bi*tra"ri*ous*ly , adverb [ Obsolete]

Arbitrary adjective [ Latin arbitrarius , from arbiter : confer French arbitraire . See Arbiter .]
1. Depending on will or discretion; not governed by any fixed rules; as, an arbitrary decision; an arbitrary punishment.

It was wholly arbitrary in them to do so.
Jer. Taylor.

Rank pretends to fix the value of every one, and is the most arbitrary of all things.

2. Exercised according to one's own will or caprice, and therefore conveying a notion of a tendency to abuse the possession of power.

Arbitrary power is most easily established on the ruins of liberty abused licentiousness.

3. Despotic; absolute in power; bound by no law; harsh and unforbearing; tyrannical; as, an arbitrary prince or government. Dryden.

Arbitrary constant , Arbitrary function (Math.) , a quantity of function that is introduced into the solution of a problem, and to which any value or form may at will be given, so that the solution may be made to meet special requirements. -- Arbitrary quantity (Math.) , one to which any value can be assigned at pleasure.

Arbitrate transitive verb [ imperfect & past participle Arbitrated ; present participle & verbal noun Arbitrating ] [ Latin arbitratus , past participle of arbitrari to be a hearer or beholder of something, to make a decision, to give judgment, from arbiter . See Arbiter .]
1. To hear and decide, as arbitrators; as, to choose to arbitrate a disputed case.

2. To decide, or determine generally. South.

There shall your swords and lances arbitrate
The swelling difference of your settled hate.

Arbitrate intransitive verb
1. To decide; to determine. Shak.

2. To act as arbitrator or judge; as, to arbitrate upon several reports; to arbitrate in disputes among neighbors; to arbitrate between parties to a suit.

Arbitration noun [ French arbitration , Latin arbitratio , from arbitrari .] The hearing and determination of a cause between parties in controversy, by a person or persons chosen by the parties.

» This may be done by one person; but it is usual to choose two or three called arbitrators ; or for each party to choose one, and these to name a third, who is called the umpire . Their determination is called the award . Bouvier

Arbitration bond , a bond which obliges one to abide by the award of an arbitration. -- Arbitration of Exchange , the operation of converting the currency of one country into that of another, or determining the rate of exchange between such countries or currencies. An arbitrated rate is one determined by such arbitration through the medium of one or more intervening currencies.

Arbitrator noun [ Latin , from arbitrari : confer French arbitrateur .]
1. A person, or one of two or more persons, chosen by parties who have a controversy, to determine their differences. See Arbitration .

2. One who has the power of deciding or prescribing without control; a ruler; a governor.

Though Heaven be shut,
And Heaven's high Arbitrators sit secure.

Masters of their own terms and arbitrators of a peace.

Syn. -- Judge; umpire; referee; arbiter. See Judge .

Aræometer (?; 277). See Areometer .

Aræostyle adjective & noun [ Latin araeostylos , Greek ...; ... at intervals + ... pillar, column.] (Architecture) See Intercolumniation .

Aræosystyle adjective & noun [ Greek ... as intervals + .... See Systyle .] (Architecture) See Intercolumniation .