Source : Webster's Revised Unabridged Dictionary (1913)

Diffuse \Dif*fuse"\, v. t. [imp. & p. p. {Diffused}; p. pr. &
   vb. n. {Diffusing}.] [L. diffusus, p. p. of diffundere to
   pour out, to diffuse; dif- = dis- + fundere to pour. See
   {Fuse} to melt.]
   To pour out and cause to spread, as a fluid; to cause to flow
   on all sides; to send out, or extend, in all directions; to
   spread; to circulate; to disseminate; to scatter; as to
   diffuse information.

         Thence diffuse His good to worlds and ages infinite.
                                                  --Milton.

         We find this knowledge diffused among all civilized
         nations.                                 --Whewell.

   Syn: To expand; spread; circulate; extend; scatter; disperse;
        publish; proclaim.

Diffused \Dif*fused"\, a.
   Spread abroad; dispersed; loose; flowing; diffuse.

         It grew to be a widely diffused opinion. --Hawthorne.
   -- {Dif*fus"ed*ly}, adv. -- {Dif*fus"ed*ness}, n.

Source : WordNet®

diffused
     adj 1: (of light rays) subjected to scattering by reflection from a
            rough surface or transmission through a translucent
            material; "diffused light"
     2: (of light) not bright or glaring; "a softer diffused
        radiance" [syn: {softened}]