Definition of vacuum tube in English:

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vacuum tube

Pronunciation: /ˈvakyo͞om ˌt(y)o͞ob/

noun

An electron tube containing a near-vacuum that allows the free passage of electric current.
Example sentences
  • A photocell is usually a vacuum tube with two electrodes.
  • In 1948 the vacuum tube was replaced by longer-lived solid-state transistors, marking the dawn of microelectronics.
  • We think of the 1950s as the golden era of the vacuum tube.

For editors and proofreaders

Syllabification: vac·u·um tube

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