noun Pathology.
a sudden and sometimes fatal affection due to exposure to the sun's rays or to excessive heat, marked by prostration with or without fever, convulsion, and coma.

1850–55; sun + stroke1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sunstroke (ˈsʌnˌstrəʊk)
heatstroke caused by prolonged exposure to intensely hot sunlight

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1851, from Fr. coup de soleil.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sunstroke or sun stroke
Heatstroke that results from undue exposure to the sun's rays and is marked by prostration and collapse, but not by fever.

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
Here they come, stumbling up the steps, dizzy from rum and sunstroke.
It is a chimera, a trick of white sky, heat and sunstroke.
Sunburn, sunstroke and heat exhaustion can all occur with dehydration and
  excess exposure to the sun.
Sunstroke and sunburn are common without the proper precautions.
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