[dee-hyoo-mid-uh-fahy-er, or, often, -yoo-]
an appliance for removing moisture from the air, as for lowering the humidity in a storage room.

1920–25; de- + humidifier Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dehumidifier (ˌdiːhjuːˈmɪdɪˌfaɪə)
a device for reducing the moisture content of the atmosphere

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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Word Origin & History

1921, agent noun from de- + humidify (see humid)
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
dehumidifier   (dē'hy-mĭd'ə-fī'ər)  Pronunciation Key 
A device used to remove water vapor from the air, thereby lowering the humidity of the air.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Keep rooms dry, and use a dehumidifier, if necessary.
Should you plan to retain the dehumidifier within your bedroom, make positive
  the sound experience degree is acceptable for you.
In addition to the above, another option is to use a dehumidifier that removes
  moisture by cooling air.
Buy or rent a fan or dehumidifier to speed up the drying process.
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