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and determining, or ordaining, without control; one whose power of deciding and governing is not limited. For Jove is arbiter of both to man. Cowper.

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. Landor.

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

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

An evergreen tree of the cypress tribe, genus Thuja. The American species is the T. occidentalis.

escribed, 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.

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

ly 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.

In England, an ecclesiastical dignitary, next in rank below a bishop, whom he assists, and by whom he is appointed, though with independent authority. Blackstone.

The district, office, or residence of an archdeacon. See Benefice. Every diocese is divided into archdeaconries. Blackstone.

A small fish (Toxotes jaculator), of the East Indies; -- so called from its ejecting drops of water from its mouth at its prey. The name is also applied to Chætodon rostratus.

of Arch, n. Court of arches, or Arches Court (Eng. Law), the court of appeal of the Archbishop of Canterbury, whereof the judge, who sits as deputy to the archbishop, is called the Dean of the Arches, because he anciently held his court in the church of St. Mary-le-Bow (de arcubus). It is now held in Westminster. Mozl…

The original pattern or model of a work; or the model from which a thing is made or formed. The House of Commons, the archetype of all the representative assemblies which now meet. Macaulay. Types and shadows of that glorious archetype that was to come into the world. South.

Of or pertaining to an archdeacon. This offense is liable to be censured in an archidiaconal visitation. Johnson.

That form of episcopacy in which the chief power is in the hands of archbishops.

Of or pertaining to an archbishop; as, Canterbury is an archiepiscopal see.

chen (Roccella tinctoria, etc.), which grow on maritime rocks in the Canary and Cape Verd Islands, etc. Tomlinson.

rew, or Archimedes' screw, an instrument, said to have been invented by Archimedes, for raising water, formed by winding a flexible tube round a cylinder in the form of a screw. When the screw is placed in an inclined position, and the lower end immersed in water, by causing the screw to revolve, the water is raised to…

An extinct genus of Bryzoa characteristic of the subcarboniferous rocks. Its form is that of a screw.

The Grecian Archipelago, or Ægean Sea, separating Greece from Asia Minor. It is studded with a vast number of small islands.