prickly heat

noun Pathology.
a cutaneous eruption accompanied by a prickling and itching sensation, due to an inflammation of the sweat glands.
Also called heat rash.

1730–40, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prickly heat
a nontechnical name for miliaria

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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American Heritage
Medical Dictionary

prickly heat prick·ly heat (prĭk'lē)
See heat rash.

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
Prickly heat or heat rash is in the form of tiny red blisters in the affected
  skin area.
Prickly heat is manifested as red papules and usually appears in areas where
  the clothing is restrictive.
Also known as prickly heat, occurs in hot, humid environments where sweat can
  not easily evaporate from the skin.
Heat stress includes faintness, painful muscle spasms and cramps and prickly
  heat caused by a skin rash from clogged pores.
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