Definition of helium noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈhiːliəm//
; NAmE NAmE//ˈhiːliəm//
[uncountable] (symbol He)
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a chemical element. Helium is a very light gas that does not burn, often used to fill balloons and to freeze food. Word Originlate 19th cent.: modern Latin, from Greek hēlios ‘sun’, because its existence was deduced from an emission line in the sun's spectrum.
See the Oxford Advanced American Dictionary entry: helium