Meaning

noun baffle that distributes sound waves evenly

noun optical device that distributes the light of a lamp evenly

adjective spread out; not concentrated in one place

originEtymology tree English diffuse Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English diffuser From diffuse (verb) + -er.

Etymology from Wiktionary, CC BY-SA 3.0