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anatomical dead space

n.
  1. The volume of the conducting airways of the nose, mouth, and trachea down to the level of the alveoli, representing that portion of inspired gas unavailable for exchange of gases with pulmonary capillary blood.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.