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

Down below is a massive carbon fiber diffuser that, especially in my tester’s stunning Rosso Dino paint, stands out enormously compared to the rest of the car. — Jerry Perez, The Drive, 6 Aug. 2026

The hair dryer is also compatible with all Supersonic™ and Supersonic Nural™ attachments, from a diffuser for curls to a flyaway attachment to smooth frizz without losing volume. — Condé Nast Traveler, 4 Aug. 2026

Under the lid are four stainless steel grates, six infrared burners and stainless heat diffusers, and a stainless steel upper rack. — John R. Delaney, PC Magazine, 4 Aug. 2026

Keep your rooms well-ventilated, and consider keeping a natural oil diffuser in your wardrobe at all times. — Nafeesah Allen, Better Homes & Gardens, 10 July 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