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perspiration

[pur-spuh-rey-shuh n]
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noun
  1. a salty, watery fluid secreted by the sweat glands of the skin, especially when very warm as a result of strenuous exertion; sweat.
  2. the act or process of perspiring.
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Origin of perspiration

1605–15, in sense “a breathing through”; 1620–30 for current senses; < New Latin perspīrātiōn- (stem of perspīrātiō) imperceptible sweating, literally, a breathing through. See perspire, -ation

Synonyms

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1. Perspiration, sweat refer primarily to moisture exuded by animals and people from the pores of the skin. Perspiration is often regarded as the more polite word, and is often used overfastidiously by those who consider sweat coarse; but sweat is a strong word and in some cases obviously more appropriate: a light perspiration; the sweat of his brow. Sweat is always used when referring to animals or objects: Sweat drips from a horse's flanks. It may also be used metaphorically of objects: Sweat forms on apples after they are gathered.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for perspiration

perspiration

noun
  1. the act or process of insensibly eliminating fluid through the pores of the skin, which evaporates immediately
  2. the sensible elimination of fluid through the pores of the skin, which is visible as droplets on the skin
  3. the salty fluid secreted through the pores of the skin; sweat
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for perspiration

n.

1610s, from French perspiration (1560s), noun of action from perspirer "perspire," from Latin perspirare "blow or breathe constantly," from per- "through" (see per) + spirare "to breathe, blow" (see spirit (n.)). Applied to excretion of invisible moistures through the skin (1620s), hence used as a euphemism for "sweat" from 1725.

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Online Etymology Dictionary, © 2010 Douglas Harper

perspiration in Medicine

perspiration

(pûr′spə-rāshən)
n.
  1. The fluid, consisting of water with small amounts of urea and salts, that is excreted through the pores of the skin by the sweat glands.
  2. The act or process of excreting this fluid through the pores of the skin.
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Related formsper•spira•to′ry (pər-spīrə-tôr′ē, pûrspər-ə-) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.