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vacuum tube
noun
Definition of vacuum tube
: an electron tube evacuated to a high degree of vacuum
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First Known Use of vacuum tube
1859
VACUUM TUBE Defined for English Language Learners
vacuum tube
noun
Definition of vacuum tube for English Language Learners
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: a glass tube that was used in the past in computers, televisions, etc., to control the flow of electricity
Medical Dictionary
vacuum tube
noun
Medical Definition of vacuum tube
: an electronic device in which conduction by electrons takes place through a vacuum within a sealed glass or metal container and which has various uses based on the controlled flow of electrons
Learn More about vacuum tube
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Britannica.com: Encyclopedia article about vacuum tube
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