thunderhead

[ thuhn-der-hed ]
/ ˈθʌn dərˌhɛd /

noun Meteorology.

the upper portion of a cumulus cloud characterized by dense, sharply defined, cauliflowerlike upper parts and sometimes by great verticality.

Origin of thunderhead

An Americanism dating back to 1850–55; thunder + head
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for thunderhead

thunderhead

/ (ˈθʌndəˌhɛd) /

noun

mainly US and 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