thermionic valve

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Concise Oxford English Dictionary © 2008 Oxford University Press:
thermionic valve (US thermionic tube)

▶noun Electronics a vacuum tube giving a flow of thermionic electrons in one direction, used especially in the rectification of a current and in radio reception.

'thermionic valve' also found in these Oxford entries:

diode - grid - grid bias - pentode - plate - tetrode - thyristor - triode - -tron - tube

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thermionic valve