mushroom cloud

noun
mushroom ( def 4 ).

Origin:
1940–45

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
mushroom cloud
 
n
the large mushroom-shaped cloud of dust, debris, etc produced by a nuclear explosion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Rather more than half of them disclose the proverbial mushroom cloud, luminous
  or vapor-borne.
The frightening-looking mushroom cloud emanating from the cooling tower
  appeared more hazardous than it actually was.
Our generation grew up literally under a mushroom cloud.
These videos revealed that each launch is accompanied by a tiny mushroom cloud.
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