atresia - WordReference.com Dictionary of English

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atresia

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Concise Oxford English Dictionary © 2008 Oxford University Press:
atresia /əˈtriːʃə, -zɪə/

▶noun

1 Medicine absence or abnormal narrowing of an opening or passage in the body.

2 Physiology the degeneration of those Graafian follicles which do not ovulate during the menstrual cycle.

– origin C19: from a-1 + Gk trēsis ‘perforation’ + -ia1.

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