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 (ə-trē′zhə, -zhē-ə)
1. The 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 a state of maturity has been reached.

[New Latin atrēsia : Greek a-, not, without; see a-1 + Greek trēsis, perforation, orifice; see terə- in Indo-European roots.]

a·tre·sic (-zĭk, -sĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(əˈtriːʒɪə; -ʒə)
(Pathology) absence of or unnatural narrowing of a body channel
[C19: New Latin, from Greek atrētos not perforated]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(əˈtri ʒə, -ʒi ə)

the absence, or failure to develop, of a normal body opening or duct, as the ear canal.
[1800–10; < Greek a- a-6 + três(is) perforation + -ia -ia]
a•tre′sic (-zɪk, -sɪk) a•tret•ic (əˈtrɛt ɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.atresia - an abnormal condition in which a normal opening or tube in the body (as the urethra) is closed or absent
abnormalcy, abnormality - an abnormal physical condition resulting from defective genes or developmental deficiencies
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


n. atresia, cierre congénito anormal de una abertura o conducto del cuerpo.
English-Spanish Medical Dictionary © Farlex 2012
References in periodicals archive ?
Then, 57 dysregulated miRNAs were identified between large atretic follicles and DFs.
If the gallbladder was atretic, without a lumen, the incision was extended and Kasai procedure was performed.
Studies conducted on rodents, cattle and sheep have also shown the resulting decrease in number of healthy follicles and increase in atretic follicles.
Damietta showed the most degenerated features in the hermaphrodite gland as atretic oocytes and sperms and atrophy of most gland components (Figure 6h,6i).
observed apparent damage of the ovary with follicular cells dispersion and vacuolar epithelial cells on microscopic examination with increase in number of atretic follicles after lead exposure.19 The study also observed that lead causes reduction in the number of primary follicles and decrease the number of follicles that enter the growing phase.
Immature or early atretic follicles promoted to grow by the gonadotrophin treatment might be one of the causes for anovulation.
These subsamples were collected from 15 specimens with ovaries in phases III and IV with neither postovulatory follicles nor atretic oocytes present.
The numbers of primary, secondary follicles, Graphian and atretic follicles and corpus leuteum were counted in all groups by optic microscopic.
Sections cut from paraffin-embedded ovaries were stained with hematoxylin and cosin to count preovulatory follicles, corpora lutea, antral follicles, and atretic follicles using a light microscope as described by Parborell et al.
A follicular wave is characterized by the emergence of a cohort of follicles [greater than or equal to] 4 mm in diameter (Knopf et al., 1989), from which one large follicle develops and subordinate follicles become atretic (Ginther et al., 1989).