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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.


(əˈtriːʒɪə; -ʒə)
(Pathology) absence of or unnatural narrowing of a body channel
[C19: New Latin, from Greek atrētos not perforated]


(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.
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


n. atresia, cierre congénito anormal de una abertura o conducto del cuerpo.
References in periodicals archive ?
However, because 1) all postspawning females had POFs present and 2) there were no females that had atretic yolked oocytes without POFs, it is unlikely that mature females were misclassified as immature in this study.
Granulomatous inflammation and fibrosis occurred in association with dead worms and, occasionally, atretic follicles.
Atretic ovaries were found in all age classes, and resting females were found in every age class except age 0 (Fig.
New POFs are easily identifiable, but those that have degenerated are difficult to distinguish from atretic follicles.
Batch fecundity was estimated from counts of hydrated oocytes from ovaries without POFs or atretic oocytes (Hunter and Macewicz, 1985).
Although atretic oocytes can be identified with the stereological method, oocytes that are destined for atresia will be counted, causing fecundity to be overestimated.
However, in July and August, their prevalence was low, whereas that of fish with ovaries containing substantial numbers of atretic yolk granule oocytes was high.
We do not know how long postovulatory follicles are distinguishable from atretic structures in the ovary of L.
Additional features used in histological staging included the presence of brown bodies and atretic oocytes and, in the case of inactive ovaries, the relative thickness of the gonad wall and the compactness of the ovarian lamellae (Samoilys and Roclofs, 2000).
Larger follicles are more likely to be atretic and of poorer quality, while smaller antral follicles relate more closely to serum levels of anti-Mullerian hormone and may better reflect the quality of the oocyte, Dr.
We examined the occurrence of atretic oocytes in Pacific sanddab, Citharichthys sordidus, collected near two offshore platforms in the Santa Barbara Channel (B and Gilda) and from two natural reference sites (off the east end of Santa Cruz Island and in mid-channel off Rincon), While pronounced atresia was observed in a few fish at one natural site and one platform, there was no evidence of widespread pronounced atresia at any of the four sites.
Oocytes were aspirated from the atretic follicles ranging in diameter from 2 to 5 mm using 18- gauge needle, into modified-PBS solution.