noun Chemistry.
a 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; atomic number: 18; atomic weight: 39.948.

1890–95; < Greek, neuter of argós inactive, not working, idle, contraction of aergós equivalent to a- a-6 + érg(on) work + -os adj. suffix Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
argon (ˈɑːɡɒn)
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
[C19: from Greek, from argos idle, inactive, from a-1 + ergon work]

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Word Origin & History

chemical element, 1894, from Gk. argon, neut. of argos "idle," from a- "without" + ergon "work" (see urge (v.)). So called by its discoverers, Baron Rayleigh and Sir William Ramsay, for its inert qualities.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

argon ar·gon (är'gŏn')
Symbol Ar
A colorless, inert gaseous element constituting [approx] one percent of Earth's atmosphere, used in electric bulbs and fluorescent tubes and as an inert gas shield in arc welding. Atomic number 18; atomic weight 39.948; melting point -189.3°C; boiling point -185.9°C.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
argon   (är'gŏn')  Pronunciation Key 
Symbol Ar
A colorless, odorless element in the noble gas group. Argon makes up about one percent of the atmosphere. It is used in electric light bulbs, fluorescent tubes, and radio vacuum tubes. Atomic number 18; atomic weight 39.948; melting point -189.2°C; boiling point -185.7°C. See Periodic Table.
The American Heritage® Science Dictionary
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Example sentences
The reactor contains argon gas, which helps keep the sodium from burning but is a dangerous asphyxiant in confined spaces.
Argon is a browser built with expansion in mind, however.
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