WordReference Random House Learner's Dictionary of American English © 2017
ar•gon /ˈɑrgɑn/USA pronunciation   n. [uncountable]
  1. Chemistrya colorless, odorless, inactive gas used in light bulbs.

WordReference Random House Unabridged Dictionary of American English © 2017
ar•gon  (ärgon),USA pronunciation n. [Chem.]
  1. Chemistrya colorless, odorless, chemically inactive, monatomic, gaseous element that, because of its inertness, is used for filling fluorescent and incandescent lamps and vacuum tubes. Symbol: Ar;
    at. no.: 18;
    at. wt.: 39.948.
  • Greek, neuter of argós inactive, not working, idle, contraction of aergós equivalent. to a- a-6 + érg(on) work + -os adjective, adjectival suffix
  • 1890–95

Collins Concise English Dictionary © HarperCollins Publishers::

argon /ˈɑːɡɒn/ n
  1. an extremely unreactive colourless odourless element of the rare gas series that forms almost 1 per cent (by volume) of the atmosphere. It is used in electric lights. Symbol: Ar; atomic no: 18; atomic wt: 39.948; density: 1.7837 kg/m³; freezing pt: –189.3°C; boiling pt: –185.9°C
Etymology: 19th Century: from Greek, from argos idle, inactive, from a-1 + ergon work

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