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[ahr-gon] /ˈɑr gɒn/
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.
Origin of argon
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. 2015.
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British Dictionary definitions for argon


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
Word Origin
C19: from Greek, from argos idle, inactive, from a-1 + ergon work
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for argon

chemical element, 1894, Modern Latin, from Greek argon, neuter of argos "lazy, idle, not working the ground, living without labor," from a- "without" (see a- (3)) + 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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argon in Medicine

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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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argon in Science
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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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