res‧pi‧ra‧tor [countable]
1 a piece of equipment that pumps air in and out of someone's lungs if they are too ill or weak to breathe [= ventilator]:
The baby was immediately put on a respirator.
2TM a piece of equipment that you wear over your nose and mouth to help you breathe in a place where there is harmful gas, smoke etc [↪ gas mask]

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