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1520s (transitive), 1650s (intransitive), from Latin diffusus, past participle of diffundere "to pour out or away" (see diffusion). Related: Diffused; diffusing.
early 15c., from Latin diffusus (see diffuse (v.)).
diffuse dif·fuse (dĭ-fyōōs')adj. Not limited to one tissue or location; widespread. v. dif·fused, dif·fus·ing, dif·fus·es (dĭ-fyōōz') To spread or to be spread widely, as through a tissue.