/ Dictionary / Index M magnetron: Meaning and Definition of Find definitions for: mag•ne•tron Pronunciation: (mag'ni-tron"), [key] — n. Electronics. 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: magnetron (Thesaurus) magnetothermoelectricity magnet school Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language