perspiration

[pur-spuh-rey-shuhn]
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.

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


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.
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World English Dictionary
perspiration (ˌpɜːspəˈreɪʃən)
 
n
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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Etymonline
Word Origin & History

perspiration
1611, from Fr. perspiration (1561), noun of action from perspirer "perspire," from L. perspirare "blow or breathe constantly," from per- "through" + spirare "to breathe, blow" (see spirit). Applied to excretion of invisible moistures through the skin (1626), hence used as
a euphemism for "sweat" from 1725.
"It is well known that for some time past, neither man, woman nor child ... has been subject to that gross kind of exudation which was formerly known by the name of sweat; ... now every mortal, except carters, coal-heavers and Irish Chairmen ... merely perspires." ["Gentleman's Magazine," 1791]
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

perspiration per·spi·ra·tion (pûr'spə-rā'shən)
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.


per·spir'a·to'ry (pər-spīr'ə-tôr'ē, pûr'spər-ə-) adj.
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
He has such an air of desperation and such a quaintly unlovely face, which is
  generally dripping perspiration.
The saliva on a smoked cigarette or the perspiration on a baseball cap may be
  enough.
It is the same as fever and ague, only that the fever is not preceded by a
  chill or followed by perspiration.
Your stomach isn't there, and your mouth is dry, and your hands are wet with
  perspiration.
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