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

For curly hair, the best thing to do is to dry at medium power with a diffuser. —Mónica Heras, Vogue, 23 May 2025

Scents of herbs and aromatics -- including lavender, rosemary, thyme, basil and garlic -- can also repel mosquitoes, especially when used in diffusers. —Arkansas Online, 8 June 2025

This slow-cooking method, often passed over by more industrialized distilleries in favor of high-pressure autoclaves or diffusers, allows the natural sugars to caramelize gently, preserving the earthy, rich characteristics of the plant. —Hudson Lindenberger, Forbes.com, 25 Apr. 2025

Chi Volumizer 4-in-1 Blowout Brush for $75: This set comes with four attachments, including an oval brush, a small diffuser, a paddle brush, and a nozzle. —Nena Farrell, Wired News, 20 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