vacuum tube

American  

noun

1. 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.

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vacuum tube British  

noun

1. another name for valve

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vacuum tube Scientific  

1. 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 In other electronic applications, vacuum tubes have largely been replaced by transistors.

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Etymology

Origin of vacuum tube

First recorded in 1775–85