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Arabian

A native of Arabia; an Arab.

Arabic

The language of the Arabians.

Arabin

A carbohydrate, isomeric with cane sugar, contained in gum arabic, from which it is extracted as a white, amorphous substance.

Arabinose

A sugar of the composition C5H10O5, obtained from cherry gum by boiling it with dilute sulphuric acid.

Arabism

An Arabic idiom peculiarly of language.

Arabist

One well versed in the Arabic language or literature; also, formerly, one who followed the Arabic system of surgery.

Araby

The country of Arabia.

Aracanese

Of or pertaining to Aracan, a province of British Burmah. A native or natives of Aracan.

Aracari

A South American bird, of the genus Pleroglossius, allied to the toucans. There are several species.

Arace

To tear up by the roots; to draw away.

Araceous

Of or pertaining to an order of plants, of which the genus Arum is the type.

Arachnida

One of the classes of Arthropoda. See Illustration in Appendix.

Arachnidial

Of or pertaining to the Arachnida. Pertaining to the arachnidium.

Arachnidium

The glandular organ in which the material for the web of spiders is secreted.

Arachnoidal

Pertaining to the arachnoid membrane; arachnoid.

Arachnology

The department of Zoology which treats of spiders and other Arachnida.

Aragonese

Of or pertaining to Aragon, in Spain, or to its inhabitants. A native or natives of Aragon, in Spain.

Aragonite

A mineral composed of calcium carbonate and identical in composition with calcite, but differing from it in its crystalline form and some of its physical characters.

Araguato

A South American monkey, the ursine howler (Mycetes ursinus). See Howler, n., 2.

aralia

any of various plants of the genus Aralia; often aromatic plants having compound leaves and small umbellate flowers.

Araliaceae

a family of mostly tropical trees and shrubs and lianas: ginseng; hedera.

Aramaic

Pertaining to Aram, or to the territory, inhabitants, language, or literature of Syria and Mesopotamia; Aram/an; -- specifically applied to the northern branch of the Semitic family of languages, including Syriac and Chaldee. The Aramaic language.

Aramean Aramaean

Of or pertaining to the Syrians and Chaldeans, or to their language; Aramaic. A native of Aram.

Aranea

a genus of common garden spiders.

Araneae

an order of arthropods constituting the spiders.

Araneidan

Of or pertaining to the Araneina or spiders. One of the Araneina; a spider.

Araneina

The order of Arachnida that includes the spiders.

Araneose

Of the aspect of a spider's web; arachnoid.

Araneous

Cobweblike; extremely thin and delicate, like a cobweb; as, the araneous membrane of the eye. See Arachnoid.

Arango

A bead of rough carnelian. Arangoes were formerly imported from Bombay for use in the African slave trade.

Arapaima

A large fresh-water food fish of South America.

Arara

The palm (or great black) cockatoo, of Australia (Microglossus aterrimus).

Araucaria

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.

Araucariaceae

a family of tall evergreen cone-bearing trees of South America and Australia with broad leathery leaves; in some classifications included in the Pinaceae.

Araucarian

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

Araujia

small genus of South American evergreen vines.

Arawn

Lord of Annwfn (the other world; land of fairies).

arb

Someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential); shortened form of arbitrageur.

Arbalist Arbalest

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.

Arbitrable

Capable of being decided by arbitration; determinable.

Arbitrage

Judgment by an arbiter; authoritative determination.

arbitrageur

someone who engages in arbitrage; i. e. one who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential.

Arbitral

Of or relating to an arbiter or an arbitration.

Arbitrarily

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

Arbitrariness

The quality of being arbitrary; despoticalness; tyranny.

Arbitrary

Depending on will or discretion; not governed by any fixed rules; as, an arbitrary decision; an arbitrary punishment.

Arbitration

The hearing and determination of a cause between parties in controversy, by a person or persons chosen by the parties.

arbitrative

of or pertaining to arbitration; relating to or having the authority to arbitrate.

Arbitrator

A person, or one of two or more persons, chosen by parties who have a controversy, to determine their differences. See Arbitration.

Arbor

A tree, as distinguished from a shrub.

Arborary

Of or pertaining to trees; arboreal.

Arboreal

Of or pertaining to a tree, or to trees; of nature of trees.

Arbored

Furnished with an arbor; lined with trees.

Arboreous

Having the form, constitution, or habits, of a proper tree, in distinction from a shrub.

Arborescence

The state of being arborescent; the resemblance to a tree in minerals, or crystallizations, or groups of crystals in that form; as, the arborescence produced by precipitating silver.

Arborescent

Resembling a tree; becoming woody in stalk; dendritic; having crystallizations disposed like the branches and twigs of a tree.

arboresque

resembling a tree in form and branching structure.

Arboretum

A place in which a collection of rare trees and shrubs is cultivated for scientific or educational purposes.

Arboricole

Tree-inhabiting; -- said of certain birds.

Arboriculture

The cultivation of trees and shrubs, chiefly for timber or for ornamental purposes.

Arborist

One who makes trees his study, or who is versed in the knowledge of trees.

Arborization

The appearance or figure of a tree or plant, as in minerals or fossils; a dendrite.

Arbuscle

A dwarf tree, one in size between a shrub and a tree; a treelike shrub.

Arbuscular

Of or pertaining to a dwarf tree; shrublike.

Arbustive

Containing copses of trees or shrubs; covered with shrubs.

Arbute Arbutus

The strawberry tree, a genus of evergreen shrubs, of the Heath family. It has a berry externally resembling the strawberry; the arbute tree.

Arc

To form a voltaic arc, as an electrical current in a broken or disconnected circuit.

arc-boutant

A buttress that stands apart from the main structure and connected to it by an arch; same as flying buttress.

Arca

the type genus of the family Arcidae, including ark shells and blood clams.

Arcade

A series of arches with the columns or piers which support them, the spandrels above, and other necessary appurtenances; sometimes open, serving as an entrance or to give light; sometimes closed at the back (as in the cut) and forming a decorative feature. A long, arched building or gallery.

Arcadia

A mountainous and picturesque district of Greece, in the heart of the Peloponnesus, whose people were distinguished for contentment and rural happiness.

Arcadic Arcadian

Of or pertaining to Arcadia; pastoral; ideally rural; as, Arcadian simplicity or scenery.

Arcanum

A secret; a mystery; -- generally used in the plural.

arcella

An amoebalike protozoan with a chitinous shell resembling an umbrella.

Arcellidae

A natural family of soil and freshwater protozoa; cosmopolitan.

Arceuthobium

A genus of chiefly American plants parasitic on conifers.

Archaean

The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life.

Archaebacteria Archaeobacteria

A group of single-celled microorganisms including the methanogens and some halophiles and thermoacidophiles, recognized in the 1970's by C. R. Woese and his colleagues as being a distinct group on the basis of RNA sequences, cell walls, and coenzymes differing from those of other microbes. It is believed to be an ancient form of living organism that evolved separately from the eubacteria and blue-green algae. It is classified as a separate kingdom by some taxonomists. See also The Archaebacteria.

Archaeography

A description of, or a treatise on, antiquity or antiquities.

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