Respirator

wiktionary

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respirate +‎  -or

etymonline

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respirator (n.)

1836, "an aid to breathing," originally a sort of metallic gauze mask fitted to the face by a wire frame and meant to keep out smoke, dust, and especially cold air; agent noun from respire. The word was later used of gas masks in World War I. As "machine to provide artificial respiration" from 1929.