American Heritage® Dictionary of the English Language, Fourth 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.
- n. chemistry Any of the elements of group 18 of the periodic table, being monatomic and (with very limited exceptions) inert.
GNU Webster's 1913
- adj. (Chem.) 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
- n. any of the chemically inert gaseous elements of the helium group in the periodic table
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