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.

1870–75; heat + stroke1

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

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Example sentences
First, it's exceedingly hot and humid, and people who enter without special
  cooling suits risk dying of heatstroke.
Not enough cooling power could mean heatstroke or dehydration.
Especially after the first racer nearly suffers heatstroke and has to be
  dragged out of his bike and doused with cold water.
The event was chalked up to heatstroke, and he returned to duty.
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