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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
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definition by Oxford Dictionaries