[uh-tree-zhuh, -zhee-uh]
noun Medicine/Medical.
the congenital absence, or the pathological closure, of an opening, passage, or cavity.

1800–10; < Neo-Latin < Greek a- a-6 + três(is) perforation + -ia -ia

atresic [uh-tree-zik, -sik] , atretic [uh-tret-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
atresia (əˈtriːʒɪə, -ʒə)
absence of or unnatural narrowing of a body channel
[C19: New Latin, from Greek atrētos not perforated]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"occlusion of a natural passage in the body," Mod.L., from Gk. atretos "not perforated," from a-, privative prefix, + tresis "perforation."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

atresia a·tre·sia (ə-trē'zhə, -zhē-ə)

  1. The congenital absence or closure of a normal body orifice or tubular passage such as the anus, intestine, or external ear canal.

  2. The degeneration and resorption of one or more ovarian follicles before maturation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Esophageal atresia is a disorder of the digestive system in which the esophagus does not develop properly.
Tricuspid atresia occurs when this valve is deformed, narrow, or missing.
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