heat exhaustion

noun
a condition characterized by faintness, rapid pulse, nausea, profuse sweating, cool skin, and collapse, caused by prolonged exposure to heat accompanied by loss of adequate fluid and salt from the body.
Also called heat prostration.


Origin:
1935–40

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Collins
World English Dictionary
heat exhaustion
 
n
Compare heatstroke Also called: heat prostration a condition resulting from exposure to intense heat, characterized by dizziness, abdominal cramp, and prostration

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

heat exhaustion n.
A condition caused by exposure to heat, marked by prostration, weakness, and collapse, resulting from unrecognized or unavoidable dehydration. Also called heat prostration.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Overexposure to the sun can result in severe sunburn, heat exhaustion or
  heatstroke.
Several firefighters were treated for heat exhaustion and smoke inhalation.
She had heat exhaustion and was on the verge of heat stroke.
Sunburn, sunstroke and heat exhaustion can all occur with dehydration and
  excess exposure to the sun.
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