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electron gun the electron-emitting cathode in a cathode ray tube together with the electromagnetic apparatus that collects and focuses the electron stream.
electron lens an electric or magnetic field, or a combination of the two, that is used to focus or deflect an electron beam.
electron microscope any of various microscopes that use electrons rather than rays of light to magnify the image of the object being viewed.
electron tube a sealed, tube-shaped container in which a pair of electrodes controls the flow of electrons through a vacuum or very low-pressure gas.
electron-volt a unit of energy equal to the energy of one electron accelerated by one volt, or equal to 1.602 times 10-12 erg.