n. A device that is used to increase the humidity of the air.
the GNU version of the Collaborative International Dictionary of English
n. A device that increases the moisture content of the air; -- used to avoid excessive dryness in buildings, which can cause irritation to the throat. Compare dehumidifier.
The Century Dictionary and Cyclopedia
n. One who or that which humidifies or moistens; specifieally, a mechanical device for moistening the atmosphere, as in a textile-factory, to keep it at a desired degree of relative humidity.
Word Usage
"The lawyers and Lowe agreed to permit a gallery employee to regularly inspect the art and to make sure Salander-O'Reilly's humidifier is working, Mollon said in an interview."