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electron a negatively charged particle, considered a fundamental unit of matter, that exists independently or outside the nucleus of an atom.
electron gun the electron-emitting cathode in a cathode ray tube together with the electromagnetic apparatus that collects and focuses the electron stream.
electronic of or relating to devices, circuits, or systems based on electronics. [2 definitions]
electronics (used with a sing. verb) the science that is concerned with the flow of electrons in various physical media, and with their properties and uses.