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An acute or chronic condition marked by severely impaired pulmonary function, characterized by elevated carbon dioxide or decreased oxygen, or both, in the arterial blood and often by the necessity of a ventilator to assist breathing.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Medicine) a condition in which the respiratory system is unable to provide an adequate supply of oxygen or to remove carbon dioxide efficiently
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014