Atelectasis, which means decreased or absent air in a entire lung, resulting in loss of lung volume, comes from the Greek "ateles" (meaning incomplete) plus "ektasis" (meaning extension, stretching out, expansion).
It was random really. They kept sending names in, and the Jockey Club kept sending them back, so by the time they got to Secretariat they were pretty far down the list on rejected names. It may have...