diffuser

noun

dif·​fus·​er di-ˈfyü-zər How to pronounce diffuser (audio)
plural diffusers
1
: one that diffuses: such as
a
: a device (such as a reflector) for distributing the light of a lamp evenly
b
: a screen (as of cloth or frosted glass) for softening lighting (as in photography)
c
: a device (such as slats at different angles) for deflecting air from an outlet in various directions
d
: a device that produces a fine mist of water and often essential oils
2
: a device for reducing the velocity and increasing the static pressure of a fluid passing through a system

Examples of diffuser in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The Rope Light is RGB-addressable and comes in 5m lengths, with a soft silicone diffuser over top that gives it an even glow. Anthony Karcz, Forbes.com, 20 May 2025 For maximum efficiency, the underbody features a flat plate, and inlets push hot air away from the car while the parabolic line along the side directs airflow toward the rear diffuser. Kristin Shaw, Popular Science, 7 May 2025 How does a diffuser differ from other hairdryer attachments? Georgia Day, Vogue, 14 May 2025 Additionally, the company sells laundry care products, plug-in air fresheners and diffusers, as well as men’s body care including cologne and body wash. Veronica Fernandez-Alvarado, Sacbee.com, 5 May 2025 See All Example Sentences for diffuser

Word History

First Known Use

1645, in the meaning defined at sense 1

Time Traveler
The first known use of diffuser was in 1645

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Cite this Entry

“Diffuser.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diffuser. Accessed 3 Jun. 2025.

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