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electromagnetic unit
electromagnetic wave
electromagnetism
electromechanical
electromedical
electrometallurgy
electrometer
electromotive
electromotive force
electromyogram
electromyograph
electron
electron affinity
electron beam
electron gun
electron lens
electron micrograph
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electron tube
e·lec·tron tube (plural e·lec·tron tubes)


noun 
Definition:
 
device where electrons flow between electrodes: a device that consists of a sealed glass vessel containing a gas or a vacuum, within which electrons flow between electrodes
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