Respirator (noun)

1. A device worn over the nose and mouth or the entire face to prevent the inhalation of harmful substances or to provide oxygen.
2. A machine used to help a person breathe.

Origin:

From the latin word "respirator" meaning "one who breathes".

Examples:

1. The workers are required to wear respirators when handling hazardous materials.
2. The patient was put on a respirator to help her breathe.
3. The respirator filters out harmful particles from the air.
4. The respirator is an important piece of equipment for firefighters.
5. The respirator is a lifesaving device for those suffering from respiratory diseases.