Origin of inert gas
First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Also called: noble gas, rare gas, argonon any of the unreactive gaseous elements helium, neon, argon, krypton, xenon, and radon
(loosely) any gas, such as carbon dioxide, that is nonoxidizing
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See noble gas.
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