/ Dictionary / Index E electron optics: Meaning and Definition of Find definitions for: elec'tron op'tics Pronunciation: [key] the study and use of the physical and optical properties of beams of electrons under the influence of electric or magnetic fields. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. electron-neutrino electron-ray tube Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language