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

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

As strings started to play Mahler’s Third Symphony, the smell of wet earth rose from our diffusers, and a virtual rainstorm began. — Max Norman, New Yorker, 25 June 2026

Luxury home buyers are increasingly weighing home scent as part of the property itself, and the choice between a whole-home HVAC diffuser and a stack of DIY plug-ins is moving from design blogs into real purchase decisions. — Lauren Jarvis-Gibson, Charlotte Observer, 24 June 2026

In other words the diffuser is one line item. — Lauren Jarvis-Gibson, Sacbee.com, 24 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