thermionic
adjective
therm·ion·ic
ˌthər-(ˌ)mī-ˈä-nik 
: relating to, using, or being the emission of charged particles (such as electrons) by an incandescent material
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This concept uses the radioisotope to produce a hot surface (typically above 1,500 °C), which then releases electrons via thermionic emission.
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IEEE Spectrum,
25 Aug. 2025
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IEEE Spectrum,
25 Aug. 2025
Cite this Entry
“Thermionic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thermionic. Accessed 6 Jul. 2026.
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