Argon

//ˈɑːɹɡɒn// noun

Definitions

Noun
  1. 1
    The chemical element (symbol Ar) with an atomic number of 18. The third most abundant gas in the Earth's atmosphere, it is a colourless, odourless, inert noble gas. countable, uncountable
  2. 2
    a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere wordnet
  3. 3
    A single atom of this element. countable

Etymology

From Ancient Greek ἀργός (argós, “idle, lazy”), because of its inertness, + -on, used for all noble gases.

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