'magnetron' definitions:

Definition of 'magnetron'

From: WordNet
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

Definition of 'magnetron'

From: GCIDE
  • magnetron \mag"ne*tron\, n. 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. [WordNet 1.5]