• synonyms


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

1800–10; < New Latin < Greek a- a-6 + três(is) perforation + -ia -ia
Related formsa·tre·sic [uh-tree-zik, -sik] /əˈtri zɪk, -sɪk/, a·tret·ic [uh-tret-ik] /əˈtrɛt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for atretic


  1. absence of or unnatural narrowing of a body channel
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Word Origin for atresia

C19: New Latin, from Greek atrētos not perforated
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for atretic



"occlusion of a natural passage in the body," 1807, from Modern Latin atresia, from Greek atretos "not perforated," from a-, privative prefix, + tresis "perforation," from PIE *tere- "to rub, turn," with derivatives referring to boring and drilling (see throw (v.)).

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Online Etymology Dictionary, © 2010 Douglas Harper

atretic in Medicine


  1. Relating to atresia.
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(ə-trēzhə, -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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.