from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An electrically charged particle, especially an electron, emitted by a conducting material at high temperatures.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics An
electrically charged particle, either an electronor an ion, emittedby a conducting materialat high temperatures
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an electrically charged particle (electron or ion) emitted by a substance at a high temperature
Sorry, no etymologies found.
The most important fact was that Mr. Richardson's opinion about the thermion-phenomenon with fixed laws was totally confirmed.