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thermionic British & World English

Relating to electrons emitted from a substance at very high temperature

thermionic valve British & World English

A device giving a flow of thermionic electrons in one direction, used especially in the rectification of a current and in radio reception

thermionic emission British & World English

The emission of electrons from a heated source

thermionic tube in thermionic valve British & World English

A device giving a flow of thermionic electrons in one direction, used especially in the rectification of a current and in radio reception