thermionic
- a of or relating to or characteristic of thermions
thermionic cathode
- The device that may change the world's means of making power: a small "thermionic converter" that now turns about 9% of its heat energy into electricity, may eventually convert .
- Ordinary thermionic tubes generate electrons by boiling them from a hot filament.
- Elster and Geitel of GermanyEarly thermionic knowledge, extended by: Profs.