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Webster 1913 Edition

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Noun.

[NL., fr. Gr. [GREEK] not perforated.]

(Med.)

Absence or closure of a natural passage or channel of the body; imperforation.

atresia ‎(plural atresias)

(pathology) A condition in which a body orifice or passage in the body is abnormally closed or absent.

atresia f ‎(plural atresie)