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1. A large dark cloud charged with electricity and producing thunder and lightning; a cumulonimbus cloud.
2. Something menacing or dreadful: thunderclouds of impending war.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Physical Geography) a towering electrically charged cumulonimbus cloud associated with thunderstorms
2. anything that is threatening
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
cu•mu•lo•nim•bus(ˌkyu myə loʊˈnɪm bəs)
n., pl. -bi (-baɪ) -bus•es.
a cloud indicative of thunderstorm conditions, characterized by large, dense towers that may reach great heights.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||thundercloud - a dark cloud of great vertical extent charged with electricity; associated with thunderstorms|
cloud - a visible mass of water or ice particles suspended at a considerable altitude
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