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TOEFL BNC: 17116 COCA: 11819

helium

noun
/ˈhiːliəm/
/ˈhiːliəm/
[uncountable]
(symbol He)
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  1. a chemical element. Helium is a very light gas that does not burn, often used to fill balloons and to freeze food.氦;氦气Topics Physics and chemistryc1
    Oxford Collocations DictionaryHelium is used before these nouns:
    • balloon
    See full entry
    Word Originlate 19th cent.: modern Latin, from Greek hēlios ‘sun’, because its existence was deduced from an emission line in the sun's spectrum.

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