an abnormality of the structure of a canal, duct, or body opening caused by a failure to develop properly or by an acquired closure, as with scar tissue
Origin of atresiaModL, ultimately ; from Classical Greek a-, a- (sense ) + tr?sis, perforation
- The absence or closure of a normal body orifice or tubular passage such as the anus, intestine, or external ear canal.
- The degeneration and resorption of one or more ovarian follicles before a state of maturity has been reached.
Origin of atresiaNew Latin atr&emacron;sia : Greek a-, not, without; see a–1 + Greek tr&emacron;sis, perforation, orifice; see ter&schwa;-1 in Indo-European roots.
- (pathology) A condition in which a body orifice or passage in the body is abnormally closed or absent.