nuee-ardente

nuée ardente

[French ny-ey ar-dahnt]
noun, plural nuées ardentes [French ny-ey zar-dahnt] . Geology.
(in a volcanic eruption) a swiftly flowing, dense cloud of hot gases, ashes, and lava fragments.

Origin:
1900–05; < French: literally, burning cloud

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World English Dictionary
nuée ardente (ˈnyeɪ ɑːˈdɑ̃t)
 
n
See also ignimbrite a rapidly moving turbulent incandescent cloud of gas, ash, and rock fragments flowing close to the ground after violent ejection from a volcano
 
[C20: from French, literally: burning cloud]

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American Heritage
Science Dictionary
nuée ardente   (n-ā' ār-däɴt')  Pronunciation Key 
Plural nuées ardentes (n-āz' ār-däɴt')
A fast moving gaseous cloud of hot ashes and other material thrown out from an erupting volcano. Nuées ardentes are often incandescent.
The American Heritage® Science Dictionary
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