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Adjective: thermionic  ,thur-mee'ó-nik or ,thur-mI'ó-nik
  1. Of or relating to or characteristic of thermions
    "thermionic cathode"

Encyclopedia: Thermionic

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thermal spring
thermalgesia
thermalise
thermalize
thermally
thermel
thermic
thermic fever
Thermidor
thermion
thermionic
thermionic current
thermionic emission
thermionic tube
thermionic vacuum tube
thermionic valve
thermionics
thermistor
thermo-
thermoacidophile
thermobaric bomb