Argon Definition

A colorless, odorless, inert gaseous element constituting approximately one percent of the earth's atmosphere, from which it is commercially obtained by fractionation for use in electric light bulbs, fluorescent tubes, and radio vacuum tubes and as an inert gas shield in arc welding. Atomic number 18; atomic weight 39.948; melting point −189.36°C; boiling point −185.85°C.
American Heritage
A colorless, odorless chemical element, one of the noble gases, constituting nearly 1% of the atmosphere: it is used in incandescent lightbulbs, electron tubes, welding, etc.: symbol, Ar; at. no. 18
Webster's New World
A chemical element (symbol Ar) with an atomic number of 18.

(physics) A rare stable isotope of argon, 3618Ar, having eighteen protons and eighteen neutrons; it amounts to about 0.3% of the element in nature.


(physics) A rare stable isotope of argon, 3818Ar, having eighteen protons and twenty neutrons; it amounts to about 0.06% of the element in nature.

  • atomic number 18
  • ar

Origin of Argon

  • From Greek ārgon neuter of ārgos idle, inert a- without a–1 ergon work werg- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Ancient Greek ἀργόν (argon), neuter of ἀργός (argos, “idle, lazy”), because of its inertness.

    From Wiktionary

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