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Definition of Mask, oxygen

Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026

Mask, oxygen: A mask that covers the mouth and nose, and is hooked up to an oxygen tank. It delivers oxygen directly to the patient. Oxygen can also be delivered directly through a nasal catheter, a tube that divides into two smaller tubes that go into the nostrils.