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

Those cars generated downforce mostly from the shape of their underfloor (rather than their wings and diffuser) and had very limited suspension setups. —Jonathan M. Gitlin, ArsTechnica, 15 June 2026

Lee also keeps an aromatherapy diffuser near the front door to mark the start and end of each day. —Hanna Wickes, Miami Herald, 13 June 2026

Reach for natural scent sources like a simmer pot with citrus peel and herbs, fresh greenery or a few drops of essential oil in a diffuser. —Lauren Jarvis-Gibson, Fort Worth Star-Telegram, 11 June 2026

Milbrand recommended a more strategic approach using diffusers. —Lauren Jarvis-Gibson, Kansas City Star, 10 June 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