Definition of atresia in English:
atresia
noun əˈtriːʃəəˈtriːziəəˈtrēZH(ē)ə
mass noun1Medicine
Absence or abnormal narrowing of an opening or passage in the body.
Example sentencesExamples
- The main objective of our study was to identify chromosomal regions possibly containing putative disease loci involved in the etiology of anal atresia.
- An X-ray revealed she had a condition called trachea oesophageal fistula and atresia, where the oesophagus and windpipe have not split properly.
- 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.
- Mary has pulmonary atresia, a condition that means the heart and the main blood vessel to the lungs have failed to develop 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.
Example sentencesExamples
- The process by which follicles degenerate and disappear is little understood and is termed follicular atresia.
- These structures form through a process of follicular atresia accompanied by hypertrophy of the follicular cells.
- Furthermore, they may cause premature depletion of the follicle pool by induction of follicular atresia or oocyte apoptosis and, thereby, lead to reduced fertility.
- 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.
Origin
Early 19th century: from a-1 'without' + Greek trēsis 'perforation' + -ia1.