respiratory system

noun Anatomy.
the system by which oxygen is taken into the body and an exchange of oxygen and carbon dioxide takes place; in mammals the system includes the nasal passages, pharynx, trachea, bronchi, and lungs.

1935–40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
respiratory system
the specialized organs, collectively, concerned with external respiration: in humans and other mammals it includes the trachea, bronchi, bronchioles, lungs, and diaphragm

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

respiratory system n.
The integrated system of organs involved in the intake and exchange of oxygen and carbon dioxide between the body and the environment and including the nasal passages, larynx, trachea, bronchial tubes, and lungs.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
respiratory system  

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The system of organs and structures in which gas exchange takes place, consisting of the lungs and airways in air-breathing vertebrates, gills in fish and many invertebrates, the outer covering of the body in worms, and specialized air ducts in insects.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
respiratory system [(res-puh-ruh-tawr-ee)]

The organs in the body involved in respiration. Air enters the body through the nose and mouth and travels down the trachea, through the bronchial tubes, and finally into the lungs. Once in the lungs, the air is drawn into an enormous number of thin-walled sacs richly supplied with capillaries. The exchange of oxygen and carbon dioxide in the blood takes place in these tiny sacs.

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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Example sentences
The general idea was it started in one form and then expanded its repertoire
  from the lymphatic to the respiratory system.
Inhalation of high concentrations affects the nervous and respiratory system.
Our respiratory system designed to aid infections and respiratory problems, as
  are our moist eye sockets.
Be calm, don't get so hyped up that you tax an already effected and taxed
  respiratory system, ie freak out and hyperventilate.
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