noble gas

noun Chemistry.
any of the chemically inert gaseous elements of group 8A or 0 of the periodic table: helium, neon, argon, krypton, xenon, and radon.
Also called inert gas.


Origin:
1900–05

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World English Dictionary
noble gas
 
n
another name for inert gas

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

noble gas no·ble gas (nō'bəl)
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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
noble gas   (nō'bəl)  Pronunciation Key 
Any of the six gases helium, neon, argon, krypton, xenon, and radon. Because the outermost electron shell of atoms of these gases is full, they do not react chemically with other substances except under certain special conditions. Also called inert gas. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
And radioactive noble gas emissions are not mentioned.
Chemists at the laboratory also determined that radon, another noble gas, is
  capable of producing chemical compounds.
Radon is a naturally occurring, radioactive, noble gas that is odorless and
  tasteless.
As a noble gas, radon is colorless, odorless and chemically inert and cannot be
  detected by human senses.
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