patent ductus arteriosus

[ pātnt; är-tîr′ē-ōsəs ]

n.

A congenital cardiac defect caused by failure of the ductus arteriosus to close at birth.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.