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atelectasis

at·e·lec·ta·sis [ àtt'l éktəssiss ]


noun 
Definition:
 
1. collapse of lung: a partial or total collapse of a lung

2. nonexpansion of lungs at birth: a condition in which the lungs fail to expand completely at birth

[Mid-19th century. < Greek atelēs "incomplete" + ektasis "extension"]
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