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

Get rid of textured, flaky skin with these $15 deep exfoliating gloves, then grab this hair dryer and diffuser from internet-famous brand Wavytalk for major hair volume. —Madeline Merinuk, PEOPLE, 9 May 2026

There’s more aerodynamic downforce courtesy of wild new body extensions, with louvers on the front wheel arches (presumably to let air escape the wheel well), a larger rear wing, new underbody diffusers, and aerodisc rear wheels. —ArsTechnica, 7 May 2026

To finish, run a curl-friendly brush through your damp hair and air-dry or use a blow-dryer with a diffuser to lock in definition and smoothness. —Aimee Simeon, Glamour, 7 May 2026

Choose a Seasonal Scent Candles, diffusers, and room sprays can help set the scene with scents that feel both fresh and of-the-moment. —Patricia Shannon, Better Homes & Gardens, 4 May 2026

Word History

Etymology

diffuse entry 2 + -er entry 2

First Known Use

1645, in the meaning defined at sense 1

Rhymes for diffuser

• abuser
• accuser
• boozer
• bruiser
• chooser
• cruiser
• loser
• user
• multiuser