argon

Etymology

From Ancient Greek ἀργόν (argón), neuter of ἀργός (argós, “idle, lazy”), because of its inertness.

noun

  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.
  2. (countable) A single atom of this element.

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