Definition of “helium” - English Dictionary

british dictionary

(Definition of “helium” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“helium” in American English

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heliumnoun [ U ]

us /ˈhi·li·əm/

a gas, one of the chemical elements, that is lighter than air and will not burn

(Definition of “helium” from the Cambridge Academic Content Dictionary © Cambridge University Press)