'diffuser' originates from Latin, specifically the word 'diffundere,' where 'dis-' meant 'apart' and 'fundere' meant 'to pour.'

'diffundere' transformed into the French word 'diffuser,' and eventually became the modern English word 'diffuser' through Middle English.

Initially, it meant 'to pour out or spread,' but over time it evolved into its current meaning of 'a device that spreads light or air evenly.'