Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of the elements in Group O of the periodic table, including helium, neon, argon, krypton, xenon, and radon, which are monatomic and with limited exceptions chemically inert. Also called inert gas.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of the elements of group 18 of the periodic table, being monatomic and (with very limited exceptions) inert.

from the GNU version of the Collaborative International Dictionary of English

  • adj. a gaseous element belonging to group VIII of the periodic table of elements, not combining with other elements under normal reaction conditions; specifically, helium, neon, argon, krypton, xenon, or radon; also called inert gas.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any of the chemically inert gaseous elements of the helium group in the periodic table

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