hereditary angioneurotic edema

n.
  1. A hereditary condition manifested by recurring episodes of edema of the skin, mucous membranes, or viscera and associated with either a deficiency of an esterase inhibitor of one of the components of complement or a functionally inactive form of the inhibitor.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.