xenon

[zee-non, zen-on]
noun Chemistry.
a heavy, colorless, chemically inactive, monatomic gaseous element used for filling radio, television, and luminescent tubes. Symbol: Xe; atomic weight: 131.30; atomic number: 54.

Origin:
1898; < Greek xénon, neuter of xénos strange (see -on2); name introduced by William Ramsay, the element's discoverer

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World English Dictionary
xenon (ˈzɛnɒn)
 
n
a colourless odourless gaseous element occurring in trace amounts in air; formerly considered inert it is now known to form compounds and is used in radio valves, stroboscopic and bactericidal lamps, and bubble chambers. Symbol: Xe; atomic no: 54; atomic wt: 131.29; valency: 0; density: 5.887 kg/m³; melting pt: --111.76°C; boiling pt: --108.0°C
 
[C19: from Greek: something strange]

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Etymonline
Word Origin & History

xenon
1898, from Gk. neut. of xenos "foreign, strange," coined by its discoverer, Scottish chemist Sir William Ramsay (1852-1916); cf. krypton.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

xenon xe·non (zē'nŏn')
n.
Symbol Xe
A colorless, odorless, highly unreactive gaseous element found in minute quantities in the atmosphere and extracted commercially from liquefied air. Atomic number 54; atomic weight 131.29; melting point -111.8°C; boiling point -108.0°C; density (gas) 5.887 grams per liter; specific gravity (liquid) 3.52 (-109°C).

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Science Dictionary
xenon   (zē'nŏn')  Pronunciation Key 
Symbol Xe
A colorless, odorless element in the noble gas group occurring in extremely small amounts in the atmosphere. It was the first noble gas found to form compounds with other elements. xenon is used in lamps that make intense flashes, such as strobe lights and flashbulbs for photography. Atomic number 54; atomic weight 131.29; melting point -111.9°C; boiling point -107.1°C; density (gas) 5.887 grams per liter; specific gravity (liquid) 3.52 (-109°C). See Periodic Table.
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Example sentences
On top of that, lasers last for a long time, whereas xenon lamps burn out and need to be replaced periodically.
It also has instruments to monitor noble gases, such as xenon.
All of it was believed to be in the form of two relatively innocuous gases, xenon and krypton.
The headlights are active xenon lamps that follow the road around curves.
Image for xenon
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