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

  • n. See noble gas.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A gas which does not undergo chemical reactions.
  • n. A noble 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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