atresia Meaning, Definition & Usage

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

WordNet

A*tre"si*a noun
Etymology
NL., fr. Gr. not perforated.
Definitions
  1. (Med.) Absence or closure of a natural passage or channel of the body; imperforation.

Webster 1913