Simple past tense and past participle of diffuse.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "diffused" in a sentence
"It was an exquisite room, possibly thirty-five by sixty and rising to a lofty trussed ceiling where a warm golden light was diffused from a skylight of yellow glass."
"But just caught the newly-refurbished Midland Hotel bathed in diffused late afternoon light."
"He played with the melancholy which the phrase diffused, he felt it stealing over him, but like a caress which only deepened and sweetened his sense of his own happiness."