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vacuum tube
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noun
Also called, especially British, vacuum valve . an electron tube from which almost all air or gas has been evacuated: formerly used extensively in radio and electronics.
a sealed glass tube with electrodes and a partial vacuum or a highly rarefied gas, used to observe the effects of a discharge of electricity passed through it.
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Origin of vacuum tube
First recorded in 1775ā85
Words nearby vacuum tube
vacuum-pack, vacuum-packed, vacuum pan, vacuum pump, vacuum servo, vacuum tube, VAD, vade mecum, V. Adm., Vadodara, vadose
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, Ā© Random House, Inc. 2023
How to use vacuum tube in a sentence
British Dictionary definitions for vacuum tube
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Ā© William Collins Sons & Co. Ltd. 1979, 1986 Ā© HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for vacuum tube
vacuum tube
An electron tube from which all air has been removed. The vacuum ensures transparency inside the tube for electric fields and moving electrons. Most electron tubes are vacuum tubes; cathode-ray tubes, which include television picture tubes and other video display tubes, are the most widely used vacuum tubes. In other electronic applications, vacuum tubes have largely been replaced by transistors.
The American HeritageĀ® Science Dictionary
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