A device that facilitates breathing in cases of respiratory failure WordNet 3.0 & Open English WordNet

A ventilator is a type of breathing apparatus, a class of medical technology that provides mechanical ventilation by moving breathable air into and out of the lungs, to deliver breaths to a patient who is physically unable to breathe, or breathing insufficiently. Wikipedia

A machine designed to move breathable air into and out of the lungs Wikipedia Disambiguation

device which provides mechanical ventilation to a patient's lungs Wikidata

A device that provides air circulation in a closed environment by rotating an helix, in order to cool down someone or something. OmegaWiki