respirations

respiration

[res-puh-rey-shuhn]
noun
1.
the act of respiring; inhalation and exhalation of air; breathing.
2.
Biology.
a.
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.
b.
an analogous chemical process, as in muscle cells or in anaerobic bacteria, occurring in the absence of oxygen.

Origin:
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

respirational, adjective
prerespiration, noun
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World English Dictionary
respiration (ˌrɛspəˈreɪʃən)
 
n
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)

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Etymonline
Word Origin & History

respiration
early 15c., from L. respirationem, noun of action from respirare (see respire).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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.

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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
respiration   (rěs'pə-rā'shən)  Pronunciation Key 


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  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.


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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

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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