- a person or thing that ventilates.
- a contrivance or opening for replacing foul or stagnant air with fresh air.
- Medicine/Medical. a respirator.
- an opening or device, such as a fan, used to ventilate a room, building, etc
- med a machine that maintains a flow of air into and out of the lungs of a patient who is unable to breathe normally
1743, agent noun from ventilate. Latin ventilator meant “a winnower.”