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

There are also deals on a relaxing oil diffuser, flameless candles for your tablescape, and a plush fleece blanket. —Izzy Baskette, PEOPLE, 8 Oct. 2025

Rounding out its selection are reed diffusers and incense cones by Virginia’s Square Trade Goods and scents by the cult Portland perfumer Blackbird. —Eric Twardzik, Robb Report, 8 Oct. 2025

If candles aren’t their cup of tea, scent diffusers are a nice alternative to setting the mood right in their new home. —Kristi Kellogg, Architectural Digest, 7 Oct. 2025

Best home fragrance deals Your home obviously needs to smell as good as you, and what better way to make it so than with candles and diffusers from Amazon? —Alanna Martine Kilkeary, Glamour, 7 Oct. 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