1. a machine that helps someone breathe by moving air into and out of their lungs
Usage: medical
2. a device that allows fresh air to enter and stale air to leave a room or building

Examples

• The patient was placed on a ventilator after the surgery.
• Doctors decided to remove him from the ventilator when his breathing improved.
• The hospital’s ventilators saved many lives during the pandemic.
• We installed a ventilator in the bathroom to reduce humidity.
• The kitchen ventilator removes cooking odors and smoke.
• Make sure the ventilator is working properly before painting indoors.