A mask placed over the nose and mouth and connected to a supply of oxygen, used when the body is not able to gain enough oxygen by breathing air, for example at high altitudes, or because of a medical condition.
- When you wake up you may find that you have an oxygen mask over your mouth and nose.
- The next thing I knew I was in a hospital bed with an oxygen mask over my mouth and nose.
- A man is lying in bed in a Catholic hospital with an oxygen mask over his mouth.
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