a machine that helps people breathe by pushing air in and out of the lungs, or a device that moves air to keep a space fresh.
From Latin 'ventilare' (to fan, winnow), from 'ventus' (wind). Originally meant any device for moving air. Became specialized to medical use in the 20th century as technology advanced.
Before mechanical ventilators existed, 'negative pressure' rooms were used—they actually sucked air out of the lungs, which terrified patients so much they called them 'iron lungs.' Modern ventilators push air in instead, which is why they feel more natural but are still traumatic.
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