heat wave

noun

Synonyms of heat wavenext
: a period of unusually hot weather

Examples of heat wave in a Sentence

Recent Examples on the Web
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The method borrows from climate science, where attribution has been used for over two decades to determine how much of a heat wave or hurricane is explained by human activity. John Drake, Forbes.com, 15 May 2026 An early-season heat wave is expected to build across much of the eastern United States next week, pushing temperatures into the 80s and 90s for millions of people. Brandi D. Addison, USA Today, 15 May 2026 The current marine heat wave technically began in May 2025, shrank as expected last fall, but then did not recede back from the coast and remained off Southern California, Leising said. Los Angeles Times, 14 May 2026 With most tropical reefs expected to face conditions like the Gulf’s by 2100—and already faltering under increasingly frequent marine heat waves—that makes the Gulf’s coral a source of valuable genetic information about resilience that could have implications for the rest of the world’s reefs. Meghan Bartels, Scientific American, 14 May 2026 See All Example Sentences for heat wave

Word History

First Known Use

1893, in the meaning defined above

Time Traveler
The first known use of heat wave was in 1893

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Cite this Entry

“Heat wave.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heat%20wave. Accessed 17 May. 2026.

Kids Definition

heat wave

noun
: a period of unusually hot weather

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