respirator

(respə rāt′ər)

noun

  1. a device, as of gauze, worn over the mouth and nose to prevent the inhaling of harmful substances, to warm the air breathed, etc.
  2. an apparatus for giving artificial respiration

See respirator in American Heritage Dictionary 4

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

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