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

This essential oil diffuser features a large, easy-to-clean water tank and several mist-nebulization modes for effective aromatherapy. — Bestreviews, Chicago Tribune, 22 June 2026

Layering too many competing scents, such as a citrus candle in one corner, a floral diffuser in another, and a woody room spray near the door, creates the scent chaos designers warn about. — Lauren Jarvis-Gibson, Fort Worth Star-Telegram, 22 June 2026

The trimaran theme and track lights are repeated in the rear apron between a floating diffuser and striking ducktail spoiler. — New Atlas, 21 June 2026

Light a Candle, Wax Melt, or Air Diffuser One of the quickest ways to mask a smelly odor is to light a candle, turn on a wax melt, or air diffuser. — Ashlyn Needham, Southern Living, 19 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