Definition of thermionic in English:

thermionic

adjective

  • Relating to electrons emitted from a substance at very high temperature.

    • ‘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.’

Pronunciation:

thermionic

/θəːmɪˈɒnɪk/