Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of the elements in Group 18 of the periodic table, including helium, neon, argon, krypton, xenon, and radon, which are monatomic and with limited exceptions chemically inert.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

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

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