Search Result for "ductus arteriosus":
Wordnet 3.0

NOUN (1)

1. a blood vessel in a fetus that bypasses pulmonary circulation by connecting the pulmonary artery directly to the ascending aorta; normally closes at birth; 



WordNet (r) 3.0 (2006):

ductus arteriosus
    n 1: a blood vessel in a fetus that bypasses pulmonary
         circulation by connecting the pulmonary artery directly to
         the ascending aorta; normally closes at birth