no·ble gas (n  b l)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. |
gas,
n a fluid with no definite volume or shape whose molecules are practically unrestricted by cohesive forces.
gas, laughing,
n See nitrous oxide.
gas, noble,
n a gas that will not oxidize; the inert gases (e.g., helium and neon).
gas, olefiant,
n a machine that uses ethylene oxide gas to sterilize objects that cannot withstand high temperatures, such as soft plastic and cloth.
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