diffuser
noun
dif·fus·er
di-ˈfyü-zər 
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
The fragrance is meant to last for two to four months without any effort on your part (no lighting candles or plugging in warmers and electric diffusers).
—
Brittney Morgan, Travel + Leisure, 12 Jan. 2026
And that’s evident in its low-sloping hood, a big rear wing, and a dual-layer diffuser.
—New Atlas, 12 Jan. 2026
Incense, simmer pots, diffusers, and candles are a simple but powerful way experts expect many will enhance their home’s sensory atmosphere in 2026.
—Kristina McGuirk, Better Homes & Gardens, 10 Jan. 2026
Active aerodynamic features, including the front lip, vertical air flaps, underbody diffusers, and a movable rear spoiler, all combine to reduce drag by up to 10 percent when set to their slipperier positions.
—Basem Wasef, Robb Report, 5 Jan. 2026
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Cite this Entry
“Diffuser.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diffuser. Accessed 20 Jan. 2026.
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