A device or object that spreads something like light, sound, or fragrance over a wider area instead of keeping it concentrated.
From diffuse + -er (agent noun suffix). The -er suffix creates a noun for something that performs the action of diffusing, likely entering English in the 18th-19th centuries as scientific terminology became more formalized.
Diffusers are everywhere in modern life—in your car's air freshener, in car headlights to spread light evenly, and in air purifiers. Engineers designed them specifically to solve the problem of uneven distribution that concentrated light or scent creates.
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