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magnetron

[mag-ni-tron] /ˈmæg nɪˌtrɒn/
noun, Electronics.
1.
a two-element vacuum tube in which the flow of electrons is under the influence of an external magnetic field, used to generate extremely short radio waves.
Origin
1920-1925
1920-25; magne(to)- + -tron
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for magnetron
  • His laboratory produced the magnetron, an invention that greatly improved the efficiency of radar.
  • Thus, things turn full circle, for the original microwave oven was based on the magnetron from a military radar.
  • The frequency offset curve shows that initial magnetron thermal drift ends with frequency lock.
  • The air from the magnetron cooling will then be re-directed to the exterior.
  • The microwave oven occurred to an experimenter when a chocolate bar melted in his pocket while he was working with a magnetron.
  • In general, there are three different methods for stabilizing the magnetron frequency and phase.
  • Tests on a dummy load showed the modulation was created by the magnetron itself.
  • The new coating tool is based on the magnetron sputtering method widely used for thin-film deposition.
  • The coaxial magnetron spectrum seems to be an improvement relative to the conventional magnetron.
  • The kiosk is powered from underneath and the body houses the power supply and magnetron.
British Dictionary definitions for magnetron

magnetron

/ˈmæɡnɪˌtrɒn/
noun
1.
an electronic valve with two coaxial electrodes used with an applied magnetic field to generate high-power microwave oscillations, esp for use in radar
Word Origin
C20: from magnet + electron
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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magnetron in Science
magnetron
  (māg'nĭ-trŏn')   
An electron tube that produces coherent microwave radiation. Magnetrons are diodes in which the electrons traveling to the anode are set in spiraling paths by a magnetic field created by permanent magnets. The circular component of the electrons' motion causes microwave-frequency oscillations in the voltage induced in resonating cavities built into the anode, which is connected to an antenna that emits the microwaves. Magnetrons are used in radar and in microwave ovens.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for magnetron

diode vacuum tube consisting of a cylindrical (straight wire) cathode and a coaxial anode, between which a dc (direct current) potential creates an electric field. A magnetic field is applied longitudinally by an external magnet. Connected to a resonant line, it can act as an oscillator. Magnetrons are capable of generating extremely high frequencies and also short bursts of very high power. They are an important source of power in radar systems and in microwave ovens.

Learn more about magnetron with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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