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

Front and rear are single pieces that can be quickly swapped and the air diffuser, engine cover, and bonnet are also made for rapid removal and replacement. —New Atlas, 14 July 2025

The Curly to Coily set has a diffuser and wide tooth comb attachment along with the curler barrel and classic blow-dryer attachments, while the Straight to Wavy set adds on a second curler barrel and a flyaway smoother tool. —Nena Farrell, Wired News, 9 July 2025

The aerodynamic downforce generated by the cars sends up huge rooster tails of spray from the rear diffusers, with more water pumped into the airflow by the treaded intermediate or wet tires. —ArsTechnica, 7 July 2025

Sapp also recommended calming wraps for their bodies, which can make animals feel like they're being hugged, and pheromone diffusers. —Clara Hendrickson, Freep.com, 4 July 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