thermionic valve
noun British.
Origin of thermionic valve
First recorded in 1915–20
Words nearby thermionic valve
thermion,
thermionic,
thermionic current,
thermionic emission,
thermionic tube,
thermionic valve,
thermionics,
thermistor,
thermit,
thermite,
thermite process
British Dictionary definitions for thermionic valve
thermionic valve
esp US and Canadian thermionic tube
noun
an electronic valve in which electrons are emitted from a heated rather than a cold cathode