diffuser
US /dɪˈfjuː.zɚ/
UK /dɪˈfjuː.zɚ/
1.
a device that diffuses something, especially light or sound
:
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The photographer used a softbox diffuser to soften the light.
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The car's rear diffuser helps improve aerodynamics.
2.
a device used to disperse essential oils or fragrances into the air
:
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She turned on her essential oil diffuser to relax.
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The aroma diffuser filled the room with a pleasant scent.