thun·​der·​head | \ ˈthən-dər-ˌhed How to pronounce thunderhead (audio) \

Definition of thunderhead

: a rounded mass of cumulus or cumulonimbus cloud often appearing before a thunderstorm

Examples of thunderhead in a Sentence

A thunderhead was forming to the west.

Recent Examples on the Web

Dr Price suspects that in his experiment the surface of the inner cylinder is taking on the role played in a thunderhead by water’s solid phase, ice. The Economist, "How to wring power from the night air," 1 Aug. 2019 The thunderhead clouds were expected to give way by Sunday morning, but temperatures in the mountains were expected to hit 93 degrees on Sunday and Monday before dropping on Tuesday. Pauline Repard, San Diego Union-Tribune, "Flash flood warning issued for Mount Laguna," 13 July 2019 Lightning strikes, and the last rays of the day struggle to penetrate an ominous thunderhead. Anne Farrar, National Geographic, "Here’s why everyone is going to Portugal now," 18 June 2019 Most of the books take place in the prolonged twilight of the 1930s, when war loomed like a distant thunderhead. Sam Sacks, WSJ, "Fiction: A Memorial Tablet in Viale Cavour," 21 Dec. 2018 Forest fires under black thunderheads that paid out no rain. Smith Henderson, Popular Mechanics, "Olympia," 20 Nov. 2017 Puffs of thunderhead smoke rising between tower blocks. Louise Doughty, New York Times, "A War Correspondent Comes Home, Bringing War With Her," 20 Apr. 2018 On ordinary days, a pleasant wisp of white or a menacing thunderhead serve a more pedestrian preoccupation, a pragmatic barometer for how to dress or where to go. Amy Ellis Nutt, Washington Post, "From cloud nine to climate change, here’s why you should always look up," 7 Oct. 2017 And so the dysfunctionality grinds on, even as the thunderheads roll in and the water levels rise. Michelle Cottle, The Atlantic, "Can Congress Bring the National Flood Insurance Program Above Water?," 5 Aug. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'thunderhead.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of thunderhead

1843, in the meaning defined above

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Statistics for thunderhead

Last Updated

12 Aug 2019

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Time Traveler for thunderhead

The first known use of thunderhead was in 1843

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English Language Learners Definition of thunderhead

chiefly US : a very large cloud appearing before a thunderstorm


thun·​der·​head | \ ˈthən-dər-ˌhed How to pronounce thunderhead (audio) \

Kids Definition of thunderhead

: a rounded mass of dark cloud with white edges often appearing before a thunderstorm

More from Merriam-Webster on thunderhead

Rhyming Dictionary: Words that rhyme with thunderhead

Comments on thunderhead

What made you want to look up thunderhead? Please tell us where you read or heard it (including the quote, if possible).


of or relating to the heavens

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