[hyoo-mid-uh-fahy-er or, often, yoo-]
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.
any device for regulating the amount of water vapor in a specific container or area.

1880–85; humidify + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
humidifier (hjuːˈmɪdɪˌfaɪə)
a device for increasing or controlling the water vapour in a room, building, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Other things you can do to help the flaky skin--run a humidifier, especially in
  the winter, while you sleep.
Collect the water that runs while you're waiting for it to heat up and use it
  to water plants or put in a humidifier.
Humidify the air with a cool mist humidifier or spend time in a steamy shower.
If your house is too dry, you should look into using a humidifier to add
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