Define thermionic. thermionic synonyms, thermionic pronunciation, thermionic translation, English dictionary definition of thermionic. n. An electrically charged particle, especially an electron, emitted by a conducting material at high temperatures. thermâ²iÂ·onâ²ic adj. adj of, relating to,...
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Posted on April 23, 2008 by jim. MSG stands for monosodium glutamate and is an food additive that, many years ago, got significant press about how bad it was for you.irst off, itâs actually the glutamic acid in the MSG that is of concern for most people and in 1959 the FDA classified MSG as âgenerally recognized as safe.â However, because glutamate is absorbed very quickly in the gastointestinal tract it can spike blood plasma levels of glutamate.