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Definition of noble gas noun from the Oxford Advanced Learner's Dictionary

noble gas

noun
 
/ˌnəʊbl ˈɡæs/
 
/ˌnəʊbl ˈɡæs/
(also inert gas, rare gas)
(chemistry)
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  1. any of a group of gases that do not react with other chemicals. Argon, helium, krypton and neon are noble gases.
See noble gas in the Oxford Advanced American Dictionary
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