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

At highway speeds, active side bumpers adjust and two rear diffuser fins extend automatically. — New Atlas, 21 Oct. 2026

To get the look, use an air-dry product like Odele Air Dry Styler, then hit it with a diffuser when your hair is mostly dry. — Lindy Segal, Glamour, 19 Oct. 2026

Keep scent subtle and neutral with a candle or diffuser, and skip anything strong. — Lauren Schuster, Kansas City Star, 19 Oct. 2026

The thrusters are integrated into the rear diffuser, and they can also be used to boost the car’s forward acceleration. — Byron Hurd, The Drive, 16 Oct. 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