heat exhaustion

noun

: a condition marked by weakness, nausea, dizziness, and profuse sweating that results from physical exertion in a hot environment

called also heat prostration

compare heatstroke

Examples of heat exhaustion in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
But heat exhaustion won’t affect your mental state, and the condition can be improved with rest, shade, and fluids. — Mira Miller, Verywell Health, 5 Aug. 2026 While this won't help entirely tackle heat exhaustion, this spot cooling tech can certainly provide some relief in unusually hot weather. — Abhimanyu Ghoshal, New Atlas, 3 Aug. 2026 Extreme weather conditions such as rain, snow, or heat can increase the likelihood of dehydration or heat exhaustion. — Tania Azhang, Sacbee.com, 3 Aug. 2026 South Florida residents should take the necessary precautions to avoid heat exhaustion and heat illness. — Lissette Gonzalez, CBS News, 30 July 2026 See All Example Sentences for heat exhaustion

Word History

First Known Use

1861, in the meaning defined above

Time Traveler
The first known use of heat exhaustion was in 1861

Rhymes for heat exhaustion

See All Rhymes for heat exhaustion

Browse Nearby Words

heat exchanger
heat exhaustion
heatful
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Cite this Entry

“Heat exhaustion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heat%20exhaustion. Accessed 11 Aug. 2026.

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Kids Definition

heat exhaustion

noun
: a condition marked by weakness, nausea, dizziness, and much sweating that results from physical exertion in a hot environment

called also heat prostration

compare heat stroke

Medical Definition

heat exhaustion

noun
: a condition characterized by faintness or fainting, palpitations, nausea, vomiting, headache, and profuse sweating and resulting from physical exertion in a hot environment

called also heat prostration

compare heatstroke

More from Merriam-Webster on heat exhaustion

Britannica.com: Encyclopedia article about heat exhaustion

Last Updated: - Updated example sentences
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