helium

Definitions


[ˈhiːlɪəm], (Noun)

Definitions:
- the chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series


Phrases:

Origin:
late 19th century: modern Latin, from Greek hēlios ‘sun’, because its existence was inferred from an emission line in the sun's spectrum




definition by Oxford Dictionaries