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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