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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.

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.

een 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.

as the remains of buildings or monuments of an early epoch, inscriptions, implements, and other relics, written manuscripts, etc.

ring tail of many vertebræ with feathers along each side, and jaws armed with teeth, with other reptilian characteristics.

The primitive enteron or undifferentiated digestive sac of a gastrula or other embryo. See Illust. under Invagination.

The standard weight or coin by which others are adjusted.

rt or science of building; especially, the art of building houses, churches, bridges, and other structures, for the purposes of civil life; -- often called civil architecture. Many other architectures besides Gothic. Ruskin.

The group of moldings, or other architectural member, above and on both sides of a door or other opening, especially if square in form.

More commonly, the molding or other ornaments with which the wall face of the voussoirs of an arch is charged.

An archbishop or other chief prelate.

The area in the central part of an amphitheater, in which the gladiators fought and other shows were exhibited; -- so called because it was covered with sand.

The quantity on which another quantity in a table depends; as, the altitude is the argument of the refraction.

The philosophy of Aristotle, otherwise called the Peripatetic philosophy.

-- To go (or walk) arm in arm, to go with the arm or hand of one linked in the arm of another. "When arm in armwe went along." Tennyson. -- To keep at arm's length, to keep at a distance (literally or figuratively); not to allow to come into close contact or familiar intercourse. -- To work at arm's length, to work…

n Church, an organization similar in some doctrines and practices to the Greek Church, in others to the Roman Catholic.

Formerly, an armor bearer, as of a knight, an esquire who bore his shield and rendered other services. In later use, one next in degree to a knight, and entitled to armorial bearings. The term is now superseded by esquire. Jacob.

artillery. Coat armor, the escutcheon of a person or family, with its several charges and other furniture, as mantling, crest, supporters, motto, etc. -- Submarine, a water-tight dress or covering for a diver. See under Submarine.

One who carries the armor or arms of another; an armiger. Judg. ix. 54.

tinct and accepted classification distinguishing armored and protected cruisers from each other, except that the first have more or heavier armor than the second.