Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A device that supplies oxygen or a mixture of oxygen and carbon dioxide for breathing, used especially in artificial respiration. Also called inhalator.
  • n. A screenlike device worn over the mouth or nose or both to protect the respiratory tract.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A device designed to allow breathing when it would otherwise be hindered, as by a medical condition or the presence of poisonous vapors.

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. An instrument for breathing through, fitted to cover the mouth, or the nose and mouth, over which it is secured by proper bandages or other appliances.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a protective mask with a filter; protects the face and lungs against poisonous gases
  • n. a breathing device for administering long-term artificial respiration

Etymologies

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Examples

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