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.
This cool mist diffuser, $18.97 at Walmart, comes in a beautiful green shade and has five light settings to create more ambiance in your room. — Nora Colomer, Fox News, 15 Mar. 2025 An essential oil diffuser with a timer can release invigorating scents, like lemon or eucalyptus, in the morning, while lavender or cedar can help ease you into sleep at night. — Katelyn Squiers, Better Homes & Gardens, 13 Mar. 2025 Researchers previously found that other scented products, like cleaners and oil diffusers, also release air pollutants, which can cause respiratory issues. — Simon Spichak, Health, 5 Mar. 2025 Shark’s tool, on the other hand, is $299.99, with options to purchase a diffuser or wide tooth comb attachment separately (about $30 each). — Claire Sullivan, WWD, 21 Feb. 2025 See All Example Sentences for diffuser

Word History

Etymology

diffuse entry 2 + -er entry 2

First Known Use

1645, in the meaning defined at sense 1

Time Traveler
The first known use of diffuser was in 1645

Rhymes for diffuser

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diffuser
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Cite this Entry

“Diffuser.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diffuser. Accessed 24 Mar. 2025.

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