follow Dictionary.com

Is irregardless a word?

vacuum tube

noun
1.
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.
2.
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.
Origin of vacuum tube
1775-1785
1775-85
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the Web for vacuum tube
Historical Examples
  • They proved what Crookes had surmised about the radiations he discovered in his vacuum tube.

  • Fluorescence is most efficiently excited by the cathode rays of a vacuum tube.

    The Nature of Animal Light E. Newton Harvey
  • If that were true a vacuum tube structure could eventually be devised to do anything a man could do.

    Human Error Raymond F. Jones
  • The terms usually apply to conductors leading the current through a liquid or gas, as an electrolytic cell, or vacuum tube.

  • The effect has been observed independently by Lo Surdo whilst working on the positive rays in a vacuum tube.

  • The electric spark, the arc, the electric discharge in a vacuum tube, and the flame are the means usually employed.

    Artificial Light M. Luckiesh
  • This is the reason the vacuum tube amplifies as well as detects.

    The Radio Amateur's Hand Book A. Frederick Collins
  • The apparatus used for the purpose consists of a vacuum tube mounted in the usual way upon a horizontal axis capable of rotation.

  • The way a grid leak and vacuum tube detector with a one-step amplifier are connected up is shown at A in Fig. 44.

    The Radio Amateur's Hand Book A. Frederick Collins
  • So engrossed were the boys in the problem of the magnet and vacuum tube that they forgot all about Herb and his experiments.

British Dictionary definitions for vacuum tube

vacuum tube

noun
1.
another name for valve (sense 3)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
vacuum tube in Science
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 Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
vacuum tube in Technology
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
Cite This Source

Word of the Day

Difficulty index for vacuum tube

Few English speakers likely know this word

Word Value for vacuum

13
18
Scrabble Words With Friends