WordReference Random House Unabridged Dictionary of American English © 2026
therm′ion′ic valve′, [Brit.]
  1. Electronics, British TermsSee vacuum tube. 
  • 1915–20

Collins Concise English Dictionary © HarperCollins Publishers::
thermionic valve, thermionic tube
  1. an electronic valve in which electrons are emitted from a heated rather than a cold cathode
'thermionic valve' also found in these entries (note: many are not synonyms or translations):
Fleming - thermionic - thermoelectron

Forum discussions with the word(s) "thermionic valve" in the title:


Look up "thermionic valve" at Merriam-Webster
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