discharge tube

noun Electronics.

Origin:
1895–1900

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Collins
World English Dictionary
discharge tube
 
n
electronics an electrical device in which current flow is by electrons and ions in an ionized gas, as in a fluorescent light or neon tube

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American Heritage
Science Dictionary
discharge tube  
A closed vessel having electrodes at either end and containing a gas at low pressure. When a sufficient voltage is applied to the electrodes, an electric current flows through the gas. Discharge tubes can be used to prevent current flow below a certain voltage; they can also function as lamps by the use of ionizing gas, which glows when current flows through the tube.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The metering unit intermittently discharges a cadaver to the discharge tube at
  a constant rate.
Stop the stopwatch at the first break or change in the continuous flow of grout
  from the discharge tube.
The ram housing, compaction chamber and discharge tube shall form an integrally
  welded body of high abrasion-resistant steel.
Stop the stop watch at the first break in the continuous flow of grout from the
  discharge tube.
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