noun Pathology.
incomplete expansion of the lungs at birth, as from lack of breathing force.
collapse of the lungs, as from bronchial obstruction.

1855–60; < Neo-Latin; see ateliosis, ectasis

atelectatic [at-l-ek-tat-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
atelectasis (ˌætəˈlɛktəsɪs)
1.  failure of the lungs to expand fully at birth
2.  collapse of the lung or a part of the lung, usually caused by bronchial obstruction
[C19: New Latin, from Greek atelēs imperfect + ektasis extension]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"incomplete expansion of the lungs," 1859, medical L., from Gk. ateles "imperfect, incomplete," lit. "without an end," (from a-, privative prefix, + telos "completion") + ektosis "extention."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

atelectasis at·e·lec·ta·sis (āt'l-ěk'tə-sĭs)

  1. The absence of gas from all or a part of the lungs, due to failure of expansion or resorption of gas from the alveoli.

  2. A congenital condition characterized by the incomplete expansion of the lungs at birth.

at'e·lec·tat'ic (-ěk-tāt'ĭk) adj.
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