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thundercloud

[thuhn-der-kloud] /ˈθʌn dərˌklaʊd/
noun
Also, thunderclouds.
Origin
1690-1700
1690-1700; thunder + cloud
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for thunder cloud

thundercloud

/ˈθʌndəˌklaʊd/
noun
1.
a towering electrically charged cumulonimbus cloud associated with thunderstorms
2.
anything that is threatening
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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thunder cloud in Science
thundercloud
  (thŭn'dər-kloud')   
See cumulonimbus.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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