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ventilator (n.)

1743, agent noun from ventilate. Latin ventilator meant "a winnower."

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Definitions of ventilator

ventilator (n.)
a device (such as a fan) that introduces fresh air or expels foul air;
ventilator (n.)
a device that facilitates breathing in cases of respiratory failure;
Synonyms: breathing device / breathing apparatus / breathing machine
From wordnet.princeton.edu