Definitions for magnetronˈmæg nɪˌtrɒn
Random House Webster's College Dictionary
a two-element vacuum tube used to generate microwaves.
Origin of magnetron:
1920–25; magne (to )- + -tron
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
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