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 assortment will include body creams and lotions, fragrance mists, Wallflower diffusers, PocketBac hand sanitizers, lip products such as glosses and scrubs, hand soaps, as well as 3-wick candles, according to Schumacher. —Jordan Green, Nashville Tennessean, 18 Aug. 2025

The diffuser failed a few minutes after launch, when sensors detected a pressure drop in the main methane tank and a pressure increase in the ship's nose cone just above the tank. —Stephen Clark, ArsTechnica, 15 Aug. 2025

Today, the simplest of items are being transformed into objets d’art, with home fragrance diffusers presenting no exception. —Austa Somvichian-Clausen, Robb Report, 14 Aug. 2025

Pair it with this essential oil diffuser to create a calming environment. —Nora Colomer May Earn A Commission If You Buy Through Our Referral Links. This Content Was Created By A Team That Works Independently From The Fox Newsroom., FOXNews.com, 12 Aug. 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