pneumothorax
noun
pneu·mo·tho·rax
ˌnü-mə-ˈthȯr-ˌaks
ˌnyü-
: a condition in which air or other gas is present in the pleural cavity and which occurs spontaneously as a result of disease or injury of lung tissue, rupture of air-filled pulmonary cysts, or puncture of the chest wall or is induced as a therapeutic measure to collapse the lung
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Merriam-Webster unabridged
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