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r arch, heavy round columns, and a great variety of ornaments, among which the zigzag and spiral or cable-formed ornaments were prominent.

a, having a thin, flat, round shell, containing a large number of small chambers arranged spirally.

An ornament, composed of vine leaves and bunches of grapes, used for decorating spiral columns.

A large spiral East Indian marine shell (Turbinella rapha); -- so called because used by native priests to hold the oil for anointing.

drawn at right angles to the axis of the curve, about that line as an axis. -- Parabolic spiral, a spiral curve conceived to be formed by the periphery of a semiparabola when its axis is wrapped about a circle; also, any other spiral curve having an analogy to the parabola.

A secondary spiral in phyllotaxy, as one of the evident spirals in a pine cone.

The lip, or edge of the aperture, of a spiral shell.

-- Persian drill (Mech.), a drill which is turned by pushing a nut back and forth along a spirally grooved drill holder. -- Persian fire (Med.), malignant pustule. -- Persian powder. See Insect powder, under Insect. -- Persian red. See Indian red (a), under Indian. -- Persian wheel, a noria; a tympanum. See Noria.…

A genus of fresh-water Pulmonifera, having reversed spiral shells. See Pond snail, under Pond.

Any myriapod of the genus Iulus and allied genera which rolls up spirally; a galleyworm. See Illust. under Myriapod.

Having an oblique spiral arrangement of planes, as levogyrate and dextrogyrate crystals.

A genus of air-breathing land snails having an elongated spiral shell. Coarctate, or Obtected, pupa, a pupa which is incased in the dried-up skin of the larva, as in many Diptera. -- Masked pupa, a pupa whose limbs are bound down and partly concealed by a chitinous covering, as in Lepidoptera.

quincuncial æstivation. Quincuncial phyllotaxy (Bot.), an arrangement of five leaves in a spiral, each leaf two fifths of a circle from the next.

f the fever, by articular and muscular pains, and by the presence, during the paroxism of spiral bacterium (Spirochæte) in the blood. It is not usually fatal. Called also famine fever, and recurring fever.

A rheostat consisting of an open frame on which are stretched spirals of wire. Being freely exposed to the air, they radiate heat rapidly.

ary; specifically (Bot. & Zoöl.), sinistrorse or sinistral; as, a reversed, or sinistral, spiral or shell.

r to a point relatively the same; a rolling back; return; as, revolution in an ellipse or spiral. That fear Comes thundering back, with dreadful revolution, On my defenseless head. Milton.

A gun, the inside of whose barrel is grooved with spiral channels, thus giving the ball a rotary motion and insuring greater accuracy of fire. As a military firearm it has superseded the musket.

Having the whorls rising from left to right; dextral; -- said of spiral shells. See Illust. of Scalaria. Right-handed screw, a screw, the threads of which, like those of a common wood screw, wind spirally in such a direction that screw advances away from the observer when turned with a right-handed movement in a fixed…

To rise in the air spirally.