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Vacancy :: Vacancy (n.) Empty space; vacuity; vacuum.

Vacuum :: Vacuum (n.) The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, as the condenser of a steam engine, which is nearly exhausted of air or steam, etc.; as, a vacuum of 26 inches of mercury, or 13 pounds per square inch..

Pan :: Pan (n.) A closed vessel for boiling or evaporating. See Vacuum pan, under Vacuum..

Gramme :: Gramme (n.) The unit of weight in the metric system. It was intended to be exactly, and is very nearly, equivalent to the weight in a vacuum of one cubic centimeter of pure water at its maximum density. It is equal to 15.432 grains. See Grain, n., 4..

Plenum :: Plenum (n.) That state in which every part of space is supposed to be full of matter; -- opposed to vacuum.

Vacuity :: Vacuity (n.) Space unfilled or unoccupied, or occupied with an invisible fluid only; emptiness; void; vacuum..

Anticathode :: Anticathode (n.) The part of a vacuum tube opposite the cathode. Upon it the cathode rays impinge.

Suck :: Suck (v. t.) To draw, as a liquid, by the action of the mouth and tongue, which tends to produce a vacuum, and causes the liquid to rush in by atmospheric pressure; to draw, or apply force to, by exhausting the air..

Leech :: Leech (n.) A glass tube of peculiar construction, adapted for drawing blood from a scarified part by means of a vacuum..

Bubble :: Bubble (n.) A globule of air, or globular vacuum, in a transparent solid; as, bubbles in window glass, or in a lens..

Pulsometer :: Pulsometer (n.) A device, with valves, for raising water by steam, partly by atmospheric pressure, and partly by the direct action of the steam on the water, without the intervention of a piston; -- also called vacuum pump..

Receiver :: Receiver (n.) The glass vessel in which the vacuum is produced, and the objects of experiment are put, in experiments with an air pump. Cf. Bell jar, and see Illust. of Air pump..

Crookes Tube :: Crookes tube () A vacuum tube in which the exhaustion is carried to a very high degree, with the production of a distinct class of effects; -- so called from W. Crookes who introduced it..

Cupping :: Cupping (n.) The operation of drawing blood to or from the surface of the person by forming a partial vacuum over the spot. Also, sometimes, a similar operation for drawing pus from an abscess..

Vacuum :: Vacuum (n.) A space entirely devoid of matter (called also, by way of distinction, absolute vacuum); hence, in a more general sense, a space, as the interior of a closed vessel, which has been exhausted to a high or the highest degree by an air pump or other artificial means; as, water boils at a reduced temperature in a vacuum..

Void :: Void (n.) An empty space; a vacuum.

Vortex :: Vortex (n.) A mass of fluid, especially of a liquid, having a whirling or circular motion tending to form a cavity or vacuum in the center of the circle, and to draw in towards the center bodies subject to its action; the form assumed by a fluid in such motion; a whirlpool; an eddy..

Injection :: Injection (n.) The act of throwing cold water into a condenser to produce a vacuum.

Emptiness :: Emptiness (n.) The state of being empty; absence of contents; void space; vacuum; as, the emptiness of a vessel; emptiness of the stomach..

Vacuist :: Vacuist (n.) One who holds the doctrine that the space between the bodies of the universe, or the molecules and atoms of matter., is a vacuum; -- opposed to plenist..

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