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blood-air barrier

n.
  1. The material intervening between alveolar air and the blood that consists of a nonstructural film or surfactant, alveolar epithelium, basement membrane, and endothelium.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.