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Dictionary


vac'uum tube"




1. Also called, esp. Brit., vac'uum 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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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