iron lung
Noun
Meaning
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: WordNetSynonyms
Hypernyms
Examples
“He said, ‘That’s an iron lung, and that’s where you’re going to end up.’
The iron lung was a "negative pressure ventilation" device that worked by altering the pressure inside the tank.
Which would have meant an iron lung.