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

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

The fountains and diffusers circulate water, increasing oxygen levels and spreading it around the pond for fish, native plants, and beneficial bacteria to improve pond health, according to SOLitude Lake Management. — Zuri Primos july 8, Kansas City Star, 8 July 2026

Rather than trying to cover up the smell with candles, air fresheners, or diffusers, focus on identifying and resolving the moisture issue that's allowing mold to grow in the first place, Rubino says. — Caroline Lubinsky, Martha Stewart, 28 June 2026

In the spirit of resourcefulness that Wilson instilled in many of us, Wassmann’s Disco Vision series incorporates upcycled LaserDiscs, a pre-DVD film format discontinued in the early aughts, as diffusers. — Adrian Madlener, Curbed, 27 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