humidifier -
A device that is used to increase the humidity of the air.
Wikipedia
A humidifier is a household appliance that increases humidity (moisture) in a single room or in the entire home. There are point-of-use humidifiers, which are commonly used to humidify a single room, and whole-house or furnace humidifiers, which connect to a home's HVAC system to provide humidity to the entire house.
OmegaWiki Dictionary
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humidifier A device used to increase humidity in a room.
