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noble gas [noble gases]▼◼◼◼noun[UK: ˈnəʊb.l̩ ɡæs] [US: ˈnoʊb.l̩ ˈɡæs]
inert gas [inert gasses]▼◼◼◻noun[UK: ɪ.ˈnɜːt ɡæs] [US: ˌɪ.ˈnɝːt ˈɡæs]
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