Search Result for "atresia": 
Wordnet 3.0

NOUN (1)

1. an abnormal condition in which a normal opening or tube in the body (as the urethra) is closed or absent;


The Collaborative International Dictionary of English v.0.48:

Atresia \A*tre"si*a\, n. [NL., fr. Gr. ? not perforated.] (Med.) Absence or closure of a natural passage or channel of the body; imperforation. [1913 Webster]
WordNet (r) 3.0 (2006):

atresia n 1: an abnormal condition in which a normal opening or tube in the body (as the urethra) is closed or absent