Webster's Dictionary, 1913

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Arbitratrix noun [ Latin , fem. of arbitrator .] A female who arbitrates or judges.

Arbitress noun [ From Arbiter .] A female arbiter; an arbitratrix. Milton.

Arblast noun A crossbow. See Arbalest .

Arbor noun [ Middle English herber , herbere , properly a garden of herbs, French herbier , from Latin herbarium . See Herb , and confer Herbarium .] A kind of latticework formed of, or covered with, vines, branches of trees, or other plants, for shade; a bower. Sir P. Sidney.

Arbor noun [ Written also arbour .] [ Latin , a tree, a beam.]
1. (Botany) A tree, as distinguished from a shrub.

2. [ Confer French arbre .] (Mech.) (a) An axle or spindle of a wheel or opinion. (b) A mandrel in lathe turning. Knight.

Arbor Day , a day appointed for planting trees and shrubs. [ U.S.]

Arbor Dianæ [ Latin , the tree of Diana, or silver.] (Chemistry) A precipitation of silver, in a beautiful arborescent form.

Arbor vine A species of bindweed.

Arbor vitæ [ Latin , tree of life.]
1. (Botany) An evergreen tree of the cypress tribe, genus Thuja . The American species is the T. occidentalis .

2. (Anat.) The treelike disposition of the gray and white nerve tissues in the cerebellum, as seen in a vertical section.

Arborary adjective [ Latin arborarius , from arbor tree.] Of or pertaining to trees; arboreal.

Arborator noun [ Latin , from arbor tree.] One who plants or who prunes trees. [ Obsolete] Evelyn.

Arboreal adjective
1. Of or pertaining to a tree, or to trees; of nature of trees. Cowley.

2. Attached to, found in or upon, or frequenting, woods or trees; as, arboreal animals.

Woodpeckers are eminently arboreal .

Arbored adjective Furnished with an arbor; lined with trees. "An arboreal walk." Pollok.

Arboreous adjective [ Latin arboreous , from arbor tree.]
1. Having the form, constitution, or habits, of a proper tree, in distinction from a shrub. Loudon.

2. Pertaining to, or growing on, trees; as, arboreous moss. Quincy.

Arborescence noun 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 adjective [ Latin arborescens , present participle of arborescere to become a tree, from arbor tree.] Resembling a tree; becoming woody in stalk; dendritic; having crystallizations disposed like the branches and twigs of a tree. " Arborescent hollyhocks." Evelyn.

Arboret noun [ Old French arboret , dim. of arbre tree, Latin arbor ] A small tree or shrub. [ Obsolete] Spenser.

Among thick-woven arborets , and flowers
Imbordered on each bank.

Arboretum noun ; plural Arboreta [ Latin , a place grown with trees.] A place in which a collection of rare trees and shrubs is cultivated for scientific or educational purposes.

Arborical adjective Relating to trees. [ Obsolete]

Arboricole adjective [ Latin arbor + colere to inhabit.] (Zoology) Tree-inhabiting; -- said of certain birds.

Arboricultural adjective Pertaining to arboriculture. Loudon.

Arboriculture noun [ Latin arbor tree + cultura . See Culture .] The cultivation of trees and shrubs, chiefly for timber or for ornamental purposes.

Arboriculturist noun One who cultivates trees.

Arboriform adjective Treelike in shape.

Arborist noun [ French arboriste , from Latin arbor tree.] One who makes trees his study, or who is versed in the knowledge of trees. Howell.

Arborization noun [ Confer French arborisation , from Latin arbor tree.] The appearance or figure of a tree or plant, as in minerals or fossils; a dendrite.

Arborized adjective Having a treelike appearance. "An arborized or moss agate." Wright.

Arborous adjective Formed by trees. [ Obsolete]

From under shady, arborous roof.

Arbuscle noun [ Latin arbuscula small tree, shrub, dim. of arbor tree.] A dwarf tree, one in size between a shrub and a tree; a treelike shrub. Bradley.

Arbuscular adjective Of or pertaining to a dwarf tree; shrublike. Da Costa.

Arbustive adjective [ Latin arbustivus , from arbustum place where trees are planted.] Containing copses of trees or shrubs; covered with shrubs. Bartram.

Arbutus, Arbute noun [ Latin arbutus , akin to arbor tree.] The strawberry tree, a genus of evergreen shrubs, of the Heath family. It has a berry externally resembling the strawberry; the arbute tree.

Trailing arbutus (Botany) , a creeping or trailing plant of the Heath family ( Epigæa repens ), having white or usually rose-colored flowers with a delicate fragrance, growing in small axillary clusters, and appearing early in the spring; in New England known as mayflower ; -- called also ground laurel . Gray.

Arc noun [ French arc , Latin arcus bow, arc. See Arch , noun ]
1. (Geom.) A portion of a curved line; as, the arc of a circle or of an ellipse.

2. A curvature in the shape of a circular arc or an arch; as, the colored arc (the rainbow); the arc of Hadley's quadrant.

3. An arch. [ Obsolete]

Statues and trophies, and triumphal arcs .

4. The apparent arc described, above or below the horizon, by the sun or other celestial body. The diurnal arc is described during the daytime, the nocturnal arc during the night.

Electric arc , Voltaic arc . See under Voltaic .

Arc (ärk) intransitive verb [ imperfect & past participle Arcked (ärkt); present participle & verbal noun Arcking .] (Electricity) To form a voltaic arc, as an electrical current in a broken or disconnected circuit.

Arc light (Electricity) The light of an arc lamp.

Arcade noun [ French arcade , Spanish arcada , Late Latin arcata , from Latin arcus bow, arch.]
1. (Architecture) (a) 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. (b) A long, arched building or gallery.

2. An arched or covered passageway or avenue.

Arcaded adjective Furnished with an arcade.

Arcadia noun [ Latin Arcadia , Greek ....]
1. A mountainous and picturesque district of Greece, in the heart of the Peloponnesus, whose people were distinguished for contentment and rural happiness.

2. Fig.: Any region or scene of simple pleasure and untroubled quiet.

Where the cow is, there is Arcadia .
J. Burroughs.

Arcadian, Arcadic adjective [ Latin Arcadius , Arcadicus , from Arcadia : confer French Arcadien , Arcadique .] Of or pertaining to Arcadia; pastoral; ideally rural; as, Arcadian simplicity or scenery.

Arcane adjective [ Latin arcanus .] Hidden; secret. [ Obsolete] "The arcane part of divine wisdom." Berkeley.

Arcanum noun ; plural Arcana [ Latin , from arcanus closed, secret, from arca chest, box, from arcere to inclose. See Ark .]
1. A secret; a mystery; -- generally used in the plural.

Inquiries into the arcana of the Godhead.

2. (Medicine) A secret remedy; an elixir. Dunglison.

Arcboutant noun [ French] (Architecture) A flying buttress. Gwilt.

Arch noun [ French arche , from Late Latin arca , for arcus . See Arc .]
1. (Geom.) Any part of a curved line.

2. (Architecture) (a) Usually a curved member made up of separate wedge-shaped solids, with the joints between them disposed in the direction of the radii of the curve; used to support the wall or other weight above an opening. In this sense arches are segmental , round (i. e., semicircular), or pointed . (b) A flat arch is a member constructed of stones cut into wedges or other shapes so as to support each other without rising in a curve.

» Scientifically considered, the arch is a means of spanning an opening by resolving vertical pressure into horizontal or diagonal thrust.

3. Any place covered by an arch; an archway; as, to pass into the arch of a bridge.

4. Any curvature in the form of an arch; as, the arch of the aorta. "Colors of the showery arch ." Milton.

Triumphal arch , a monumental structure resembling an arched gateway, with one or more passages, erected to commemorate a triumph.

Arch transitive verb [ imperfect & past participle Arched ; present participle & verbal noun Arching .]
1. To cover with an arch or arches.

2. To form or bend into the shape of an arch.

The horse arched his neck.

Arch intransitive verb To form into an arch; to curve.

Arch (ärch) adjective [ See Arch- , prefix ]
1. Chief; eminent; greatest; principal.

The most arch act of piteous massacre.

2. Cunning or sly; sportively mischievous; roguish; as, an arch look, word, lad.

[ He] spoke his request with so arch a leer.

Arch noun [ See Arch- , pref .] A chief. [ Obsolete]

My worthy arch and patron comes to-night.

Arch brick A wedge-shaped brick used in the building of an arch.

Arch stone A wedge-shaped stone used in an arch; a voussoir.

Arch- (ärch-, except in archangel and one or two other words). [ Latin arch- , Greek .... See Arch- .] A prefix signifying chief , as in arch builder, arch fiend.