| 单词 | thermionic valves |
| 释义 | thermion /thûrˈmi-ən/nounAn electrically-charged particle, an electron or ion, emitted by an incandescent body ORIGIN: Gr thermē heat, and ion thermionˈic adjective Of or relating to thermions thermionˈics singular noun The science of thermions and thermionic emissions thermionic emission noun The emission of electrons from incandescent solids or liquids thermionic valve or thermionic tube noun A vacuum tube containing a heated cathode from which electrons are emitted, an anode for collecting some or all of these electrons and, generally, additional electrodes for controlling their flow to the anode |
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