a chemical element. Helium is a very light gas that does not burn, often used to fill balloons and to freeze food. Topics Physics and chemistryc1氦;氦气 Oxford Collocations DictionaryHelium is used before these nouns:- balloon
Word Originlate 19th cent.: modern Latin, from Greek hēlios ‘sun’, because its existence was deduced from an emission line in the sun's spectrum.