from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The exchange of oxygen and carbon dioxide between the environment and respiratory organs such as gills or lungs.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation
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