hypostatic pneumonia

n.
  1. Pulmonary congestion due to the stagnation of blood in the dependent portions of the lungs in old persons or in those who are ill and lie in the same position for long periods.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.