atelectasis (n.)youdaoicibaDictYouDict[atelectasis 词源字典]
"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.[atelectasis etymology, atelectasis origin, 英语词源]