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

rare gas

noun
 
/ˌreə ˈɡæs/
 
/ˌrer ˈɡæs/
(also inert gas, noble 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 rare gases.
See rare gas in the Oxford Advanced American Dictionary

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