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

Several horses collapsed from heat exhaustion after competing in stifling heat in the middle of the day during the cross-country phase of the eventing. — Danielle Rossingh, New York Times, 21 Aug. 2026

Officials urge residents to limit time outdoors, stay hydrated, and be aware of the symptoms of heat exhaustion and heatstroke. — Mateo Rosiles, USA Today, 20 Aug. 2026

That's particularly true in hospitals where nurses have been known to collapse from heat exhaustion, according to the Royal College of Nursing. — ABC News, 13 Aug. 2026

The hiker, who was suffering from severe dehydration and heat exhaustion, was far up the mountain, a social media post from the Pulaski County Government says. — Arkansas Online, 12 Aug. 2026

Word History

First Known Use

1861, in the meaning defined above

Rhymes for heat exhaustion

• faustian

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