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iron blue
Iron Cross
Iron Curtain
iron curtain
iron gray
iron hand
iron horse
iron law of wages
iron lung
iron maiden
iron out
iron oxide
iron pan
iron pyrites
iron ration
iron triangle
iron-willed
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iron lung
i·ron lung (plural i·ron lungs)


noun 
Definition:
 
breathing apparatus: an airtight metal cylinder encasing a patient up to the neck, formerly used to provide help in breathing by alternating air pressure within the cylinder
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