atresiaPronunciation: /əˈtriːʃə, -zɪə/Definition of atresia noun [mass noun] 1 Medicine absence or abnormal narrowing of an opening or passage in the body. 2 Physiology the degeneration of those ovarian follicles which do not ovulate during the menstrual cycle. Origin: early 19th century: from a-1 'without' + Greek trēsis 'perforation' + -ia1atresia in other Oxford dictionaries Definition of atresia in the US English dictionary
