electronic-tube

electronic tube

Dictionary.com Unabridged

electron tube

noun
an electronic device that consists, typically, of a sealed glass bulb containing two or more electrodes: used to generate, amplify, and rectify electric oscillations and alternating currents.
Also called electronic tube.


Origin:
1920–25

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
electron tube
 
n
Also called: vacuum tube, Sometimes shortened to: tube an electrical device, such as a valve, in which a flow of electrons between electrodes takes place

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
electron tube  
A sealed glass tube containing either a vacuum or a small amount of gas, in which electrons move from a negatively charged electrode, the cathode, to a positively charged one, the anode. The cathode is usually heated by an electric current to free the electrons. Other electrodes in the tube can vary the electric or magnetic fields in the tube to control the strength and direction of the moving electrons. electron tubes are used to amplify signals, rectify AC currents, and produce x-rays, among other uses. They have been mostly replaced by transistors but are still used in television screens, computer monitors, and microwave technology. Also called valve. See also vacuum tube.
The American Heritage® Science Dictionary
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