Adjective
of or relating to or characteristic of thermions
Source: WordNetTechnical difficulties of all sorts have been ignored, certainly, but also ignored are means as yet unknown which may come any day to accelerate technical progress as violently as did the advent of the thermionic tube. Vannevar Bush
thermionic cathode Source: Internet
Colossus Mark I contained 1500 thermionic valves (tubes), but Mark II with 2400 valves, was both 5 times faster and simpler to operate than Mark 1, greatly speeding the decoding process. Source: Internet
Electrons, however, could not pass in the reverse direction because the plate was not heated and thus not capable of thermionic emission of electrons. Source: Internet
In order to move from the hot emitter to the vacuum, an electron's energy must exceed the emitter Fermi level by an amount : determined simply by the thermionic work function of the emitter. Source: Internet
As the tube output required little electronic processing, a distinct advantage in the thermionic valve era due to minimal valve count and low power consumption, the instrument achieved great popularity as a portable radiation detector. Source: Internet