pneumatocele

from The Collaborative International Dictionary of English v.0.48

Pneumatocele \Pneu*mat"o*cele\, n. [Pneumato- + Gr. ? a tumor;
   cf. F. pneumatoc[`e]le.] (Med.)
   A distention of the scrotum by air; also, hernia of the
   lungs.
   [1913 Webster]