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vacuum

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{adj: evacuated} emptied by being pumped out or having a vacuum created
"a highly evacuated glass tube"



{adj: freeze-dried} preserved by freezing and drying in a vacuum
"freeze-dried coffee"

{adj: lyophilized, lyophilised, freeze-dried} used of tissue or blood or serum or other biological substances; dried by freezing in a high vacuum

{adv: in vacuo} in a vacuum

{n: A battery} battery used to heat the filaments of a vacuum tube

{n: B battery} battery for supplying a constant positive voltage to the plate of a vacuum tube

{n: C battery} battery used to maintain the grid potential in a vacuum tube

{n: De Forest, Lee De Forest, Father of Radio} United States electrical engineer who in 1907 patented the first triode vacuum tube, which made it possible to detect and amplify radio waves (1873-1961)

{n: Dewar flask, Dewar} vacuum flask that holds liquid air or helium for scientific experiments

{n: Hoover, William Hoover, William Henry Hoover} United States industrialist who manufactured vacuum cleaners (1849-1932)

{n: Hoover} a kind of vacuum cleaner

{n: Silex} a vacuum coffee maker

{n: X-ray tube} a vacuum tube containing a metal target onto which a beam of electrons is directed at high energy for the generation of X rays

{n: acorn tube} a small vacuum tube; used at high frequencies

{n: air pump, vacuum pump} a pump that moves air in or out of something

{n: cathode-ray tube, CRT} a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen

{n: condensation pump, diffusion pump} vacuum pump used to obtain a high vacuum

{n: distortion} a change (usually undesired) in the waveform of an acoustic or analog electrical signal; the difference between two measurements of a signal (as between the input and output signal)
"heavy metal guitar players use vacuum tube amplifiers to produce extreme distortion"

{n: dropper, eye dropper} pipet consisting of a small tube with a vacuum bulb at one end for drawing liquid in and releasing it a drop at a time

{n: dust bag, vacuum bag} a bag into which dirt is sucked by a vacuum cleaner

{n: electron multiplier} a vacuum tube that amplifies a flow of electrons

{n: electronic equipment} equipment that involves the controlled conduction of electrons (especially in a gas or vacuum or semiconductor)

{n: freeze-drying, lyophilization, lyophilisation} a method of drying food or blood plasma or pharmaceuticals or tissue without destroying their physical structure; material is frozen and then warmed in a vacuum so that the ice sublimes

{n: grid, control grid} an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube

{n: ion pump} a vacuum pump that removes gas by ionizing the atoms or molecules and adsorbing them on a metal surface

{n: light hour} the distance light travels in a vacuum in one hour; approximately one billion kilometers

{n: light minute} the distance light travels in a vacuum in one minute; approximately 18 million kilometers

{n: light second} the distance light travels in a vacuum in one second; approximately 300,000 kilometers

{n: light year, light-year} the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers

{n: magnetron} a diode vacuum tube in which the flow of electrons from a central cathode to a cylindrical anode is controlled by crossed magnetic and electric fields; used mainly in microwave oscillators

{n: neon, Ne, atomic number 10} a colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts

{n: plate} the positively charged electrode in a vacuum tube

{n: refractive index, index of refraction} the ratio of the velocity of light in a vacuum to that in a medium

{n: special relativity, special theory of relativity, special relativity theory, Einstein's special theory of relativity} a physical theory of relativity based on the assumption that the speed of light in a vacuum is a constant and the assumption that the laws of physics are invariant in all inertial systems

{n: speed of light, light speed, c} the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second

{n: suction curettage, vacuum aspiration} a method of induced abortion; prior to the 14th week of gestation the embryo and placenta are removed by applying suction to the dilated cervix

{n: thermionics} the branch of electronics dealing with thermionic phenomena (especially thermionic vacuum tubes)

{n: thermobaric bomb, fuel-air bomb, vacuum bomb, volume-detonation bomb, aerosol bomb} a bomb that uses a fuel-air explosive
"a thermobaric bomb can create overpressures equal to an atomic bomb"

{n: thermos, thermos bottle, thermos flask} vacuum flask that preserves temperature of hot or cold drinks

{n: tickler coil} a small coil in series with the anode of a vacuum tube and coupled to the grid to provide feedback

{n: triode} a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which making amplification possible

{n: tube, vacuum tube, thermionic vacuum tube, thermionic tube, electron tube, thermionic valve} electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

{n: vacuum chamber} a chamber from which nearly all matter (especially air) has been removed

{n: vacuum flask, vacuum bottle} flask with double walls separated by vacuum; used to maintain substances at high or low temperatures

{n: vacuum gauge, vacuum gage} a gauge for indicating negative atmospheric pressure

{n: vacuum, vacuity} a region that is devoid of matter

{n: vacuum, vacuity} the absence of matter

{n: vacuum, vacuum cleaner} an electrical home appliance that cleans by suction

{n: void, vacancy, emptiness, vacuum} an empty area or space
"the huge desert voids"
"the emptiness of outer space"
"without their support he'll be ruling in a vacuum"

{v: evacuate, exhaust} create a vacuum in (a bulb, flask, reaction vessel, etc.)

{v: freeze-dry} preserve by rapid freezing and subsequently drying in a vacuum
"freeze-dry the strawberries"

{v: lock in, seal in} close with or as if with a tight seal
"This vacuum pack locks in the flavor!"

{v: lyophilize, lyophilise} to dry (blood, serum, tissue, etc.) by freezing in a high vacuum

{v: suck} draw into the mouth by creating a practical vacuum in the mouth
"suck the poison from the place where the snake bit"
"suck on a straw"
"the baby sucked on the mother's breast"

{v: suck} draw something in by or as if by a vacuum
"Mud was sucking at her feet"

{v: vacuum, vacuum-clean, hoover} clean with a vacuum cleaner
"vacuum the carpets"


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