Noun
respirator that produces alternations in air pressure in a chamber surrounding a patient's chest to force air into and out of the lungs thus providing artificial respiration
Source: WordNet“He said, ‘That’s an iron lung, and that’s where you’re going to end up.’ Source: Internet
The iron lung was a "negative pressure ventilation" device that worked by altering the pressure inside the tank. Source: Internet
Which would have meant an iron lung. Source: Internet