respirator

res·pi·ra·tor

noun \ˈres-pə-ˌrāt-ər\

Definition of RESPIRATOR

1

: a device (as a gas mask) worn over the mouth and nose to protect the respiratory system by filtering out dangerous substances (as dust or fumes) from inhaled air

2

: a device for maintaining artificial respiration <a mechanical respirator>—called also ventilator