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

The result is a diffuser-like experience in a compact format, tailored for everyday driving. —Jon Stojan, USA Today, 27 Apr. 2026

Make working from home more enjoyable with a clever USB desk fan ($8) and soothing essential oil diffuser ($7). —Mariana Best, Better Homes & Gardens, 25 Apr. 2026

Linens, rugs, and curtains are cool and white, and skin and hair products are by Casanera, a brand founded by three Corsican sisters that also makes exquisite candles and diffusers. —Condé Nast, Condé Nast Traveler, 23 Apr. 2026

Or, swap out your mom’s antiquated diffuser plug-ins with this non-toxic alternative. —Izzy Baskette, PEOPLE, 21 Apr. 2026

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