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 candles and diffusers are made with proprietary formulas, featuring the highest percentage of oil in the industry, with fragrances made by master perfumers that utilize the most important ingredients. — ABC News, 14 Sep. 2026

Keep reading to find out how to use a diffuser on various types of hair, along with styling tips, from Chloe Homan, CEO and founder of the Curlfriend Collective, which sells products just for curly hair. — Bestreviews, Mercury News, 31 Aug. 2026

To use lavender oil in repelling mice, soak cotton balls or run a diffuser throughout your home. — Emily Benda Gaylord, The Spruce, 28 Aug. 2026

The curious intruder appeared particularly interested in the shop's inventory, tearing into a sweet-tea blend and investigating tea diffusers as a crowd gathered outside. — Michael Sinkewicz, FOXNews.com, 23 Aug. 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