interalveolar septum

[ĭn′tər-ăl-vēə-lər]
n.
  1. The close-meshed capillary network covered by thin alveolar epithelial cells that intervenes between adjacent pulmonary alveoli.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.