Diffuser

Part of speech: noun

Pronunciation: /dɪˈfjuːsə(ɹ)/

Definitions

1. An apparatus utilized to soften light or air by spreading it out, a device created to blend and distribute aromas evenly in a space, and a tool engineered to lessen the strength of a signal or illumination while keeping its essential features intact
2. A tool designed to distribute light or air smoothly over an area ; an instrument that emits scent gently to fill a room ; a component that diffuses waves or signals to reduce concentration
3. An object that softens and spreads sources of light or airflow ; a machine that releases aromas softly into the atmosphere ; a part embedded in systems to disperse radiated energy efficiently

Etymology: The "-er" in "diffuser" is one of English's oldest and most productive suffixes, and it arrived here by a long route. It descends from Latin "-arius", which marked a person or thing connected with something, and it passed through Old French "-ier" into Middle English "-er", with roots reaching back through Proto-Germanic to an Old English "-ere" that was already attached to native words for doers and agents. Few English suffixes have been used so steadily for so long. The base is "diffuse", a verb meaning to spread outward or scatter, which comes from the Latin "diffundere", "to pour out in different directions". Pouring and spreading give the word its physical sense, so a diffuser is literally a thing that spreads something out, whether that is light through frosted glass or a fragrance through a room. The device's name is therefore a plain agent noun built from an existing verb rather than a special coinage.

Synonyms: disperser, scatterer, disseminator