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thunderhead
thun·der·head [ thúndər hèd ] (plural thun·der·heads)


noun 
Definition:
 
upper mass of cloud predicting thunderstorm: the upper rounded mass of a cumulonimbus cloud associated with the development of a thunderstorm
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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