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thunderhead

American  
[thuhn-der-hed] / ˈθʌn dərˌhɛd /

noun

Meteorology.
  1. incus.

  2. cumulonimbus.

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


thunderhead British  
/ ˈθʌndəˌhɛd /

noun

  1. 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

Etymology

Origin of thunderhead

An Americanism dating back to 1850–55; thunder + head

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Once a prehistoric denizen of the deeps, it comes ashore on a tsunami tide, tall as a thunderhead, shrugging off artillery as it bellows a foghorn scream.

From Scientific American • Nov. 3, 2023

Last Wednesday, though, conditions led to the creation of a larger, taller cloud called a pyrocumulonimbus, which is similar to a thunderhead.

From New York Times • Jul. 19, 2021

A thunderhead towers above the rising sun, and the picture turns out beautifully.

From Slate • May 11, 2015

Early that morning, a towering thunderhead had rumbled in from the east, stripping branches from the cottonwoods and flooding the streets of Oklahoma City.

From The New Yorker • Dec. 1, 2014

Mount Elgon brooded over the town and the trees, rising to an undefined height, its profile buried in an anvil thunderhead, bathed in golden light.

From "The Hot Zone" by Richard Preston