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humidifier

American  
[hyoo-mid-uh-fahy-er, yoo-] / hjuˈmɪd əˌfaɪ ər, ju- /

noun

  • humidifiers
    plural
  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.


humidifier British  
/ hjuːˈmɪdɪˌfaɪə /

noun

  1. a device for increasing or controlling the water vapour in a room, building, etc

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Noun Inflected Forms

Etymology

Origin of humidifier

First recorded in 1880–85; humidify + -er 1

Explanation

A machine that fills the air around it with moisture is called a humidifier. Turning on a humidifier can help you breathe more easily when you have a bad cold. When the air in a room is too dry, it can cause all kinds of problems: itchy skin, irritated eyes, and coughing. A humidifier is a device that humidifies (or adds moisture to) a space by sending steam or water vapor into the air. The word comes from humid, or "damp," and its Latin root humidus, which means "wet." If your houseplants are turning brown and slightly crispy, you should definitely try using a humidifier.

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Provide ample humidity by misting the plant daily, running a humidifier nearby or placing the pot on a shallow pebble-filled tray to which you’ve added water.

From Washington Times Oct. 17, 2023

I have a water bottle with me everywhere I go and at night I’ll sleep with a humidifier beside my bed.

From Los Angeles Times Sep. 29, 2023

Put fans in the child’s room or set up a cool mist humidifier to help their lungs.

From Seattle Times Dec. 19, 2022

A humidifier might help you sleep better by moisturizing your nose and throat, she added, but it probably can’t stop your snoring.

From New York Times May 12, 2022

Then she pushed the bag back as far as she could on the highest shelf in the closet, behind the towels and a humidifier.

From "Eleanor & Park" by Rainbow Rowell

WSJ | Buy Side: Don’t miss these Prime Day deals on kitchen appliances, humidifiers, smart home accessories, bed linens and more.

From The Wall Street Journal Jun. 25, 2026

Her son Lewis, now 22, is dependent on a ventilator, as well as humidifiers, suction machines and oxygen concentrators, to keep him alive, after falling seriously ill as a toddler.

From BBC May 27, 2026

Nearly all get delivered by McKellen’s Julian, waving a champagne coupe while monologuing about humidifiers, cancel culture and a doctor who smells like radishes.

From Los Angeles Times Apr. 9, 2026

Using humidifiers in the bedroom can be another way to counteract dry skin, because that’s where people spend the most time at home.

From National Geographic Nov. 28, 2023

In several places in England and abroad, where there is a scarcity of moisture, artificial humidifiers have been tried, but no cheap and satisfactory one has hitherto been discovered.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 5 "Cosway" to "Coucy" by Various

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