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respiration

[res-puh-rey-shuh n] /ˌrɛs pəˈreɪ ʃən/
noun
1.
the act of respiring; inhalation and exhalation of air; breathing.
2.
Biology.
  1. the sum total of the physical and chemical processes in an organism by which oxygen is conveyed to tissues and cells, and the oxidation products, carbon dioxide and water, are given off.
  2. an analogous chemical process, as in muscle cells or in anaerobic bacteria, occurring in the absence of oxygen.
Origin
late Middle English
1400-1450
1400-50; late Middle English respiracioun < Latin respīrātiōn- (stem of respīrātiō) a breathing out, equivalent to respīrāt(us) (past participle of respīrāre to respire) + -iōn- -ion
Related forms
respirational, adjective
prerespiration, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for respirations

respiration

/ˌrɛspəˈreɪʃən/
noun
1.
the process in living organisms of taking in oxygen from the surroundings and giving out carbon dioxide (external respiration). In terrestrial animals this is effected by breathing air
2.
the chemical breakdown of complex organic substances, such as carbohydrates and fats, that takes place in the cells and tissues of animals and plants, during which energy is released and carbon dioxide produced (internal respiration)
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 respirations

respiration

n.

late 14c., from Latin respirationem (nominative respiratio) "breathing, respiration," noun of action from past participle stem of respirare (see respire).

Online Etymology Dictionary, © 2010 Douglas Harper
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respirations in Medicine

respiration res·pi·ra·tion (rěs'pə-rā'shən)
n.
Abbr. R

  1. The act or process of inhaling and exhaling; breathing. Also called ventilation.

  2. The act or process by which an organism without lungs, such as a fish or plant, exchanges gases with its environment.

  3. The oxidative process occurring within living cells by which the chemical energy of organic molecules is released in a series of metabolic steps involving the consumption of oxygen and the liberation of carbon dioxide and water.

  4. Any of various analogous metabolic processes by which organisms, such as fungi, obtain energy from organic molecules.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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respirations in Science
respiration
  (rěs'pə-rā'shən)   

  1. The process by which organisms exchange gases, especially oxygen and carbon dioxide, with the environment. In air-breathing vertebrates, respiration takes place in the lungs. In fish and many invertebrates, respiration takes place through the gills. Respiration in green plants occurs during photosynthesis.

  2. See cellular respiration.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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respirations in Culture

respiration definition


The conversion of oxygen by living things into the energy by which they continue life. Respiration is part of metabolism.

Note: Carbon dioxide is a waste product of respiration.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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14
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