heatstroke

[heet-strohk]
noun
a disturbance of the temperature-regulating mechanisms of the body caused by overexposure to excessive heat, resulting in fever, hot and dry skin, and rapid pulse, sometimes progressing to delirium and coma.

Origin:
1870–75; heat + stroke1

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Collins
World English Dictionary
heatstroke (ˈhiːtˌstrəʊk)
 
n
See sunstroke a condition resulting from prolonged exposure to intense heat, characterized by high fever and in severe cases convulsions and coma

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

heat stroke n.
A severe condition caused by impairment of the body's temperature-regulating abilities, resulting from prolonged exposure to excessive heat and characterized by cessation of sweating, severe headache, high fever, hot dry skin, and, in serious cases, collapse and coma.

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
There was no drinking water, and people collapsed from heat stroke.
Overheating can cause serious, even life-threatening conditions such as heat
  stroke.
She had heat exhaustion and was on the verge of heat stroke.
Conversely, heat stroke or dehydration may occur strenuous hiking.
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