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

Since mom already has the candle version, gift her the matching reed diffuser to have her fave scent coursing through her space on a regular basis. —Audrey Lee, Architectural Digest, 14 Apr. 2026

Once any chemical smells are gone, a lightly scented candle or diffuser adds a nice touch without being too overpowering. —Kate Donovan, Martha Stewart, 11 Apr. 2026

Peppermint oil used as aromatherapy should be inhaled directly from the bottle or through a diffuser. —T'keyah Bazin, Verywell Health, 9 Apr. 2026

With a little bit of styling pomade and a diffuser, this style is ideal for thin, wavy to curly hair types. —Ariel Wodarcyk, InStyle, 7 Apr. 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