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definition of the word helium

by the Wiktionnary

Chemical element
He Previous: hydrogen (H)
Next: lithium (Li)

Modern Latin, from Ancient Greek ἥλιος (sun) (because its presence was first theorised in the sun's atmosphere).


countable and uncountable; heliums

helium (countable and uncountable; plural heliums)

  1. (uncountable) A colorless and inert gas, and the second lightest chemical element (symbol He) with an atomic number of 2 and atomic weight of 4.002602.
  2. (countable) A form or sample of the element.

Definition from Wiktionary
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