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pressing, or the condition of being pressed; compression; a squeezing; a crushing; as, a pressure of the hand.

Wires leading from various points of an electric system to a central station, where a voltmeter indicates the potential of the system at those points.

A mode of arresting hemorrhage resulting from wounds or surgical operations, by passing under the divided vessel a needle, the ends of which are left exposed externally on the cutaneous surface. Simpson.

Compression.

utterance; representation. [Obs.] An operation more divine Than breath or pen can give expressure to. Shak.

Having or involving a pressure greatly exceeding that of the atmosphere; -- said of steam, air, water, etc., and of steam, air, or hydraulic engines, water wheels, etc.

Dent; impression. [Obs.] Shak.

Having, employing, or exerting, a low degree of pressure. Low- pressure steam engine, a steam engine in which low steam is used; often applied to a condensing engine even when steam at high pressure is used. See Steam engine.

Oppression. [Obs.]

Excessive pressure or urging. London Athenæum.

The pressure or tension of a confined body of vapor. The pressure of a given saturated vapor is a function of the temperature only, and may be measured by introducing a small quantity of the substance into a barometer and noting the depression of the column of mercury.

In breech-loading firearms, the block behind the barrel which receives the pressure due to recoil.

- Ad`i*a*bat`ic*al*ly, adv. Adiabatic line or curve, a curve exhibiting the variations of pressure and volume of a fluid when it expands without either receiving or giving out heat. Rankine.

The science of measuring the air, including the doctrine of its pressure, elasticity, rarefaction, and condensation; pneumatics.

A drill driven by the elastic pressure of condensed air; a pneumatic drill. Knight.

attention. -- Alarm gauge, a contrivance attached to a steam boiler for showing when the pressure of steam is too high, or the water in the boiler too low. -- Alarm post, a place to which troops are to repair in case of an alarm.

An instrument for measuring sensations of pain due to pressure. It has a piston rod with a blunted tip which is pressed against the skin. -- Al*gom"e*try (#), n. -- Al`go*met"ric (#), *met"ric*al (#), a. --Al`go*met"ric*al*ly, adv.

A unit, employed in calculating fall of pressure in distributing mains, equivalent to a current of one ampère flowing through one foot of conductor.

d of barometer. Aneroid barometer, a barometer the action of which depends on the varying pressure of the atmosphere upon the elastic top of a metallic box (shaped like a watch) from which the air has been exhausted. An index shows the variation of pressure.

re opposite in character, as regards direction of the wind and distribution of barometric pressure, to that of a cyclone. -- An`ti*cy*clon"ic, a. -- An`ti*cy*clon"ic*al*ly, adv.