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thunderhead

[thuhn-der-hed] /ˈθʌn dərˌhɛd/
noun, Meteorology
1.
incus (def 2).
3.
the upper portion of a cumulus cloud characterized by dense, sharply defined, cauliflowerlike upper parts and sometimes by great verticality.
Origin
1850-1855
1850-55, Americanism; thunder + head
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for thunder heads

thunderhead

/ˈθʌndəˌhɛd/
noun
1.
(mainly US & Canadian) the anvil-shaped top of a cumulonimbus cloud
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for thunder heads

thunderhead

n.

"high-piled cloud," 1861, from thunder (n.) + head (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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Word Value for thunder

11
12
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