atelectasis noun. 
[atɪ'lɛktǝsɪs] M19.[from Greek 
atelēs imperfect + 
ektasis extension.]
Medicine. Incomplete dilatation of the lungs; collapse of a lung or part of a lung.
 ■   atelectatic 
[,atɪlɛk'tatɪk] adjective L19.  [TahlilGaran] English Dictionary ▲