/hyooh mid"euh fuy'euhr/ or, often, /yooh-/ , n.
1. a device for increasing the amount of water vapor in the air of a room or building, consisting of a container for water and a vaporizer.
2. any device for regulating the amount of water vapor in a specific container or area.
[ 1880-85; HUMIDIFY + -ER 1 ]