Definitions for magnetronˈmæg nɪˌtrɒn
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Random House Webster's College Dictionary
mag•ne•tronˈmæg nɪˌtrɒn(n.)
a two-element vacuum tube used to generate microwaves.
Origin of magnetron:
1920–25; magne (to )- + -tron
Princeton's WordNet
magnetron(noun)
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
Wiktionary
magnetron(Noun)
a device in which electrons are made to resonate in a specially shaped chamber and thus produce microwave radiation; used in radar, and in microwave ovens
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"magnetron." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/magnetron>.