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

On the outside, Ringbrothers added lots of carbon, including the rear tail panel, rear diffuser, rear quarter panels, hood, grille surround, and in the interior. —Erik Shilling, Robb Report, 5 Nov. 2025

Available from Monday at a selection of The Bridge and Vranjes Firenze stores, as well as their respective e-commerce platforms, the home diffusers will retail at 108 euros and 254 euros for the 500-ml. —Sandra Salibian, Footwear News, 3 Nov. 2025

Not Considering Size Trying to compensate for the wrong-size reed diffuser by adding or removing reeds is the wrong way to go, says Xu. —Patricia Shannon, Better Homes & Gardens, 1 Nov. 2025

Plus, the full scent trio of two candles and a diffuser will run you less than $75 with sale prices. —Audrey Lee, Architectural Digest, 29 Oct. 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