A ventilator is a machine that brings in good air that's safe to breathe and keeps bad air out. A kitchen ventilator uses fans and filters to direct greasy stove exhaust outside.

There are architectural ventilators, for keeping the air inside buildings clean, and also medical ventilators, which work to keep breathable air moving in and out of a patient's lungs. This kind of ventilator is only used when someone is unable to breathe effectively on their own. In both cases, ventilators are all about air. The word comes from the Latin root ventulus, "a breeze."

Definitions of ventilator
  1. noun
    a device (such as a fan) that introduces fresh air or expels foul air
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    type of:
    an instrumentality invented for a particular purpose
  2. noun
    a device that facilitates breathing in cases of respiratory failure
    synonyms: breathing apparatus, breathing device, breathing machine
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    Aqua-Lung, aqualung, scuba
    a device (trade name Aqua-Lung) that lets divers breathe under water; scuba is an acronym for self-contained underwater breathing apparatus
    oxygen mask
    a breathing device that is placed over the mouth and nose; supplies oxygen from an attached storage tank
    inhalator, respirator
    a breathing device for administering long-term artificial respiration
    a breathing apparatus used for resuscitation by forcing oxygen into the lungs of a person who has undergone asphyxia or arrest of respiration
    breathing device consisting of a bent tube fitting into a swimmer's mouth and extending above the surface; allows swimmer to breathe while face down in the water
    iron lung
    respirator that produces alternations in air pressure in a chamber surrounding a patient's chest to force air into and out of the lungs thus providing artificial respiration
    type of:
    an instrumentality invented for a particular purpose
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