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

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

Compared to the larger diffusers, which can alternate between two scents, this device holds one fragrance vial at a time, which can be easily swapped out depending on your mood. —Rachel Trujillo, People.com, 5 May 2025

Up front, the grille is blacked out and there’s a new splitter, there are new sills along the side, and, in the back, the bumper and diffuser have been reworked. —Bryan Hood, Robb Report, 30 Apr. 2025

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