Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. 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 the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

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

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

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

Etymologies

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  • Yes, we have thunderheads.

    September 30, 2008