English Reference
Noun

diffuser

n. countable
B2 Upper Intermediate UK /dɪfjˈuːsɐ/ dif·fus·er UK spelling diffusers Cooking

n.a small machine that turns water and essential oils into a fine mist. You use it to make a room smell nice or to help you relax.

n.an electronic device that converts liquid into a fine mist using ultrasonic vibrations. Often used for aromatherapy or to humidify indoor air.


SIMPLE

I use a diffuser with lavender oil to help me sleep.

CONTEXTUAL

The hotel room was equipped with a high-quality diffuser to ensure guests enjoyed a relaxing scent throughout their stay.

COMPLEX

While some prefer traditional candles, many modern wellness enthusiasts opt for a digital diffuser, which allows for precise control over the intensity and duration of the aromatic mist.

On one day, the diffusers released a citrus scent; on another, the scent of fresh laundry; and on the third day, no scent was used.

Phys.org· 8 Sept 2026

Buying candles, diffusers and room sprays "can help create a warm, cosy atmosphere, especially as we move into the colder months".

BBC News· 26 Aug 2026
This entry
Level B2 · Upper Intermediate
Frequency Occasional
Updated