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.
Heat must be respected as heat exhaustion can lead to heat stroke which can be fatal. — Nicole Williams, AJC.com, 6 July 2026 Drink lots of water and look out for signs of heat stroke and heat exhaustion, like dizziness and nausea. — Kimberlee Speakman, PEOPLE, 3 July 2026 Learn to identify the warning signs of heat exhaustion and heat stroke. — Nc Weather Bot, Charlotte Observer, 5 July 2026 Six firefighters and nearby civilians were treated for heat exhaustion. — Fort Worth Star-Telegram, 23 June 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 7 Jul. 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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