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

What’s more, the thoughtful design offers easy installation, adjustable spray, and even aromatherapy diffusers if that’s your steez. —Simon Hill, Wired News, 28 Mar. 2025

Two more ducts direct air through the underbody and out through a rear diffuser for extra stability. —Lawrence Ulrich, Robb Report, 25 Mar. 2025

But as diffusers and candles have grown in popularity, the trend has started to come home. —Susan Campos, The Hollywood Reporter, 23 Mar. 2025

For curly hair, use a diffuser to slowly dry strands, using hands to define curls and separate strands as needed. —Marie Bladt, Vogue, 28 Feb. 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