atelectasis

https://doi.org/10.1351/goldbook.10434
  1. Total or partial collapse of the lung.
  2. Congenital condition characterized by the incomplete expansion of the lungs at birth.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 727 (https://doi.org/10.1515/pac-2015-1202)