A divice of gauze or wire, covering the mouth or nose, to prevent the inhalation of noxious substances, as dust or smoke. Being warmed by the breath, it tempers cold air passing through it, and may also be used for the inhalation of medicated vapors.
- A device that supplies oxygen or a mixture of oxygen and carbon dioxide for breathing, used especially in artificial respiration. Also called inhalator.
- A screenlike device worn over the mouth or nose or both to protect the respiratory tract.