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

 

noble gas

 noun
noun
BrE
 
; NAmE
 
(also inert gas, rare gas)(chemistry)
 
jump to other results
any of a group of gases that do not react with other chemicals. Argon, helium, krypton and neon are noble gases.
See the Oxford Advanced American Dictionary entry: noble gas