Definition of atresia in English:



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

    ‘The Foundation is of vital importance to Sarah and her family because her youngest daughter, Carol, was diagnosed last year with a rare liver disease called biliary atresia.’
    • ‘The main objective of our study was to identify chromosomal regions possibly containing putative disease loci involved in the etiology of anal atresia.’
    • ‘Mary has pulmonary atresia, a condition that means the heart and the main blood vessel to the lungs have failed to develop properly.’
    • ‘An X-ray revealed she had a condition called trachea oesophageal fistula and atresia, where the oesophagus and windpipe have not split properly.’
    • ‘Cheryl was diagnosed with pulmonary atresia as a baby, and underwent two heart operations when she was six-months-old and five.’
  • 2Physiology
    The degeneration of those ovarian follicles which do not ovulate during the menstrual cycle.

    ‘The process by which follicles degenerate and disappear is little understood and is termed follicular atresia.’
    • ‘Furthermore, they may cause premature depletion of the follicle pool by induction of follicular atresia or oocyte apoptosis and, thereby, lead to reduced fertility.’
    • ‘These structures form through a process of follicular atresia accompanied by hypertrophy of the follicular cells.’
    • ‘Mammalian females have a fixed number of oocytes at birth, which decreases dramatically with advancing age due to follicular atresia.’
    • ‘This results in atresia of the dominant follicle and re-initiation of follicular recruitment.’



/əˈtrēZH(ē)ə/ /əˈtriʒ(i)ə/


Early 19th century from a-‘without’ + Greek trēsis ‘perforation’+ -ia.