noun Meteorology.
incus ( def 2 ).
the upper portion of a cumulus cloud characterized by dense, sharply defined, cauliflowerlike upper parts and sometimes by great verticality.

1850–55, Americanism; thunder + head Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thunderhead (ˈθʌndəˌhɛd)
chiefly (US), (Canadian) the anvil-shaped top of a cumulonimbus cloud

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
They live under a dark cloud, a thunderhead that follows them from stadium to stadium.
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