/ Dictionary / Index B betatron: Meaning and Definition of Find definitions for: be•ta•tron Pronunciation: (bā'tu-tron" or, esp. Brit., bē'-), [key] — n. Physics. an accelerator in which electrons are accelerated to high energies by an electric field produced by a changing magnetic field. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: betatron (Thesaurus) beta test beta waves Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language