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[pur-spuh-rey-shuh n] /ˈpɜr spəˈreɪ ʃən/
a salty, watery fluid secreted by the sweat glands of the skin, especially when very warm as a result of strenuous exertion; sweat.
the act or process of perspiring.
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
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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for perspiration


the act or process of insensibly eliminating fluid through the pores of the skin, which evaporates immediately
the sensible elimination of fluid through the pores of the skin, which is visible as droplets on the skin
the salty fluid secreted through the pores of the skin; sweat
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
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Word Origin and History for perspiration

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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perspiration in Medicine

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

  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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