helium

Từ điển Oxford Advanced Learner 8th

he·lium BrE [ˈhiːliəm] NAmE [ˈhiːliəm] noun uncountable (symb. He)
a chemical element. Helium is a very light gas that does not burn, often used to fill ↑balloons and to freeze food.

Word Origin:
[helium] late 19th cent.: modern Latin, from Greek hēlios ‘sun’, because its existence was deduced from an emission line in the sun's spectrum.

• Từ đồng nghĩa / Synonyms:
  He, atomic number 2