atresia Syllabification: (a·tre·sia)Pronunciation: /əˈtrēZH(ē)ə/Definition of atresia noun 1 Medicine absence or abnormal narrowing of an opening or passage in the body. 2 Physiology the degeneration of those ovarian follicles that 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 British & World English dictionary
