Etymology
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atresia (n.)

"occlusion of a natural passage in the body, absence of a natural opening or passage," 1807, from Modern Latin atresia, from Greek atretos "not perforated," from a- "not, without" (see a- (3)) + tresis "perforation," from PIE root *tere- (1) "to rub, turn," with derivatives referring to boring and drilling. Related: Atresic.

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Definitions of atresia

atresia (n.)
an abnormal condition in which a normal opening or tube in the body (as the urethra) is closed or absent;
From wordnet.princeton.edu