helium

Meaning

Noun

• 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.
• A form or sample of the element.

Related

Similar words

• E939 when used as a packaging gas

Origin

• From New Latin helium, from Ancient Greek ἥλιος ("sun") (because its presence was first theorised in the Sun's atmosphere) with the suffix -ium.