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

Allure Allure commerce producer Sarah Hoffmann after blowing out her hair with the new Supersonic R with the diffuser attachment. —Marci Robin, Allure, 5 Mar. 2025

The flashing lights didn’t make it from Safety Car to production Black Series, but the free-breathing exhaust system, actively cooled limited slip rear differential, carbon fiber rear diffuser, flat-bottom steering wheel, interior trim, and, perhaps most obviously, its widebody design did. —Jeremy Korzeniewski, Robb Report, 26 Feb. 2025

Aerodynamic rakes are metal fence-like structures covered in sensors that are typically positioned around the front axle or rear axle and diffuser. —Yara Elshebiny, Forbes, 22 Feb. 2025

Available in six woodgrain types, this essential oil diffuser can match any decor and features customizable LED lighting. —Bestreviews, Chicago Tribune, 4 Feb. 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