Definition of thermionic in English:

thermionic

Syllabification: therm·i·on·ic
Pronunciation: /ˌTHərmīˈänik
 
/

adjective

Of or relating to electrons emitted from a substance at very high temperature.
More example sentences
  • The thorium dispersion enhances thermionic electron emission, which in turn improves the starting characteristics of gas tungsten arc welding electrodes.
  • Electricity can be generated by the thermionic effect, that is, the use of dissimilar metals can cause electrons to flow in the presence of heat.

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