Definition of thermionic valve in English:

thermionic valve

Line breaks: thermi|on¦ic valve
(US thermionic tube)

noun

Electronics
A device giving a flow of thermionic electrons in one direction, used especially in the rectification of a current and in radio reception.
More example sentences
  • It's rather odd therefore that even though we ditched thermionic valves for transistors and integrated circuits many years ago, the cathode ray tube has remained the most cost-effective display system.
  • The speaker or singer uses a microphone feeding into the above-mentioned amplifier, which incorporates vacuum tubes (thermionic valves).
  • The basic thermionic tube with three electrodes is called a triode in view of the number of electrodes.

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Pronunciation: ˈapəzɪt
adjective
apt in the circumstances or relation to something