respirator
noun
res·pi·ra·tor
ˈre-spə-ˌrā-tər
plural respirators
1
: a mask or device worn over the mouth and nose to protect the respiratory system by filtering out dangerous substances (such as dusts, fumes, or bacteria) from inhaled air
Note: Particulate respirator masks are only able to filter out particles and are not effective against gases or vapors. A numerical rating (such as 95 or 99) is sometimes assigned to such a respirator to indicate the percentage of airborne particles filtered. A letter may also be assigned to indicate whether it is somewhat resistant (R), not resistant (NR), or strongly resistant (P) to the degrading effects of oil on proper respirator function.
2
: a device for maintaining artificial respiration : ventilator sense b
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Merriam-Webster unabridged
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