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
magnetron in American English
(ˈmægnəˌtrɑn)
noun
an electron tube in which the flow of electrons from the cathode to one or more anodes is controlled by an externally applied magnetic field: usedto generate alternating currents at microwave frequencies