helium
Meaning
- (uncountable) The second-lightest chemical element (symbol He), with an atomic number of 2 and atomic weight of 4.002602, a colorless, odorless and inert noble gas.
- (countable) A form or sample of the element.
Synonyms
hélium
Helium
helio
elio
helium
hélio
heli
helyum
ήλιο
helium
هيليوم
eli
hêlyûmFrequency
Pronounced as (IPA)
/ˈhiː.li.əm/
Etymology
From New Latin helium, from Ancient Greek ἥλιος (hḗlios, “sun”) (because its presence was first theorised in the Sun's atmosphere) with the suffix + -ium. Probably coined by Norman Lockyer. This suffix is unusual, because it is usually used only for metallic elements. It is likely that Lockyer, being an astronomer, was unaware of the usual chemical conventions.
Notes
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