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

Pair it with a personalized hair towel and a fragrance diffuser for the ultimate self-care starter pack. —Jamie Fischer, Better Homes & Gardens, 30 Sep. 2025

This reed diffuser combines notes of palo santo, clove, vetiver, and incense for a fresh yet homey essence. —Ali Faccenda, PEOPLE, 27 Sep. 2025

One of its most recent iterations, the Supersonic Nural, comes outfitted with a groundbreaking Wave + Curl hair diffuser that functions two ways. —Stacia Datskovska, Footwear News, 26 Sep. 2025

The heavy glass vessel is 1. stunning and 2. holds significantly more liquid than your typical scent diffuser (two full liters). —Sophia Panych, Allure, 16 Sep. 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