noun Pathology.

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

Origin of atelectasis

1855–60; < New Latin; ateliosis + Greek éktasis a stretching out, equivalent to ek- ec- + ta-, variant stem of teínein to stretch + -sis -sis
Related formsat·e·lec·tat·ic [at-l-ek-tat-ik] /ˌæt l ɛkˈtæt ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for atelectatic



failure of the lungs to expand fully at birth
collapse of the lung or a part of the lung, usually caused by bronchial obstruction

Word Origin for atelectasis

C19: New Latin, from Greek atelēs imperfect + ektasis extension
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for atelectatic



"incomplete expansion of the lungs," 1836, medical Latin, from Greek ateles "imperfect, incomplete," literally "without an end," (from a-, privative prefix, + telos "completion") + ektosis "extention." Related: Atelectatic.

Online Etymology Dictionary, © 2010 Douglas Harper

atelectatic in Medicine




The absence of gas from all or a part of the lungs, due to failure of expansion or resorption of gas from the alveoli.
A congenital condition characterized by the incomplete expansion of the lungs at birth.
Related formsat′e•lec•tatic (-ĕk-tătĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.