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

This cool mist ultrasonic aroma oil diffuser has a large tank and shuts off automatically when the water runs low. —Nora Colomer, Fox News, 13 Jan. 2025

At the back, there's a massive diffuser and a projecting ducktail spoiler. —New Atlas, 5 Jan. 2025

The redness diffuser can be used all over or as a spot treatment. —Celia Shatzman, Forbes, 2 Jan. 2025

My experiments have involved countless hair diffusers, salt sprays, curl creams, and mousses (plus at least a dozen TikTok hacks) to no avail. —Zoë Weiner, Glamour, 1 Jan. 2025

Word History

Etymology

diffuse entry 2 + -er entry 2

First Known Use

1645, in the meaning defined at sense 1