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A receptacle of air in various parts of the system; as, a cell or minute cavity in the walls of the air tubes of the lungs; the air sac of birds; a dilatation of the air vessels in insects.

e part, called the nave, by a row of columns or piers, which support the roof or an upper wall containing windows, called the clearstory wall.

A lead ore found in Cornwall, England, and used by potters to give a green glaze to their wares; potter's ore.

A white fibrous mineral frequently found on the walls of mines and quarries, chiefly hydrous sulphate of alumina; -- also called feather alum, and hair salt.

A room formerly in the Czar's Summer Palace in Russia, which was richly decorated with walls and fixtures made from amber. The amber was removed by occupying German troops during the Second World War and has, as of 1997, never been recovered. The room is being recreated from old photographs by Russian artisans. PJC…

a concealed station. Hence: Unseen peril; a device to entrap; a snare. Heaven, whose high walls fear no assault or siege Or ambush from the deep. Milton.

Of or relating to, or produced by, love. "Amorous delight." Milton. "Amorous airs." Waller.

The corner or quoin of a wall, cross-beam, or rafter. [Obs.] Gwilt.

ked on or fixed to the angle of any architectural work, esp. for protecting an angle of a wall. -- Angle brace, Angle tie (Carp.), a brace across an interior angle of a wooden frame, forming the hypothenuse and securing the two side pieces together. Knight. -- Angle iron (Mach.), a rolled bar or plate of iron having…

nt in large numbers they produce a severe anæmia by sucking the blood from the intestinal walls. Called also miner's anæmia, tunnel disease, brickmaker's anæmia, Egyptian chlorosis.

A species of pier produced by thickening a wall at its termination, treated architecturally as a pilaster, with capital and base.

An outwork of a strong, high wall, with turrets, in front gateway (as of an old castle), for defending the entrance.

an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall. An aperture between the mountains. Gilpin. The back aperture of the nostrils. Owen.

nts 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.

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

illet, a triangular piece of wood used to raise the slates of a roof against a chimney or wall, to throw off the rain. Gwilt. -- Arris gutter, a gutter of a V form fixed to the eaves of a building. Gwilt.

To happen or occur. [Archaic] Happy! to whom this glorious death arrives. Waller.

Of or pertaining to, or containing, arsenic; as, arsenical vapor; arsenical wall papers. Arsenical silver, an ore of silver containing arsenic.

Abnormal thickening and hardening of the walls of the arteries, esp. of the intima, occurring mostly in old age. -- Ar*te`ri*o*scle*rot"ic (#), a.

carry either venous or arterial blood from the heart. They have tricker and more muscular walls than veins, and are connected with them by capillaries.