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alveolar gas

n.
  1. The gas in the pulmonary alveoli and alveolar sacs, where the oxygen-carbon dioxide exchange with pulmonary capillary blood occurs.alveolar air
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.