Machines or devices designed to remove excess moisture and humidity from air in rooms, basements, or other enclosed spaces.
From dehumidify + -er (a device that does something) + -s (plural). The word entered common usage in the mid-20th century as such appliances became household products.
If you live somewhere damp, dehumidifiers literally pull water out of the air—they collect it in a tank or drain it away, and that's why you sometimes hear them running constantly on humid days.
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