Definition of "thundercloud" [thun•der•cloud]

• A large dark cloud charged with electricity and producing thunder and lightning; a cumulonimbus cloud. (noun)
• Something menacing or dreadful: thunderclouds of impending war. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "When the thundercloud is over the cork, click the cloud."
• "The sword/staff drawing a line along the curve of the thundercloud is a brilliant touch."
• "If I cared about numbers I would measure these shadows and thundercloud bruises and stagnant mosquito magnet hours."