Other forms: vaporizers
In medicine, a vaporizer is a machine that distributes medication in the form of a gas that a patient inhales. It's also another name for a humidifier, a device that increases moisture in the air.
A vapor is a gas, and the job of a vaporizer is to create vapor. A child who's badly congested might need to breathe the warm steam of a home vaporizer to ease a cough. And a patient preparing for surgery often inhales their anesthesia through a mask with the aid of a vaporizer. The word comes from the Latin root vaporem, "a warm exhalation" or "steam."