from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The swollen upper portion of a thundercloud, usually associated with the development of a thunderstorm.

from The Century Dictionary.

  • noun One of the round compact swelling cumulus clouds which frequently develop into thunder-clouds.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A rounded mass of cloud, with shining white edges; a cumulus, -- often appearing before a thunderstorm.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The top portion of a cumulonimbus cloud, which tend to be flattened or fibery in appearance, and which may be indicative of thunderstorm activity.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a rounded projecting mass of a cumulus cloud with shining edges; often appears before a thunderstorm


Sorry, no etymologies found.


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  • Yes, we have thunderheads.

    September 30, 2008