verb (used with object), dif·fused, dif·fusing.

  1. to pour out and spread, as a fluid.
  2. to spread or scatter widely or thinly; disseminate.
  3. Physics. to spread by diffusion.

verb (used without object), dif·fused, dif·fusing.

  1. to spread.
  2. Physics. to intermingle by diffusion.


  1. characterized by great length or discursiveness in speech or writing; wordy.
  2. widely spread or scattered; dispersed.
  3. Botany. widely or loosely spreading.
  4. Optics. (of reflected light) scattered, as from a rough surface (opposed to specular).

verb (dɪˈfjuːz)

  1. to spread or cause to spread in all directions
  2. to undergo or cause to undergo diffusion
  3. to scatter or cause to scatter; disseminate; disperse

adjective (dɪˈfjuːs)

  1. spread out over a wide area
  2. lacking conciseness
  3. (esp of some creeping stems) spreading loosely over a large area
  4. characterized by or exhibiting diffusiondiffuse light; diffuse reflection
  5. botany (of plant growth) occurring throughout a tissue

v.1520s (transitive), 1650s (intransitive), from Latin diffusus, past participle of diffundere “to pour out or away” (see diffusion). Related: Diffused; diffusing. adj.early 15c., from Latin diffusus (see diffuse (v.)). adj.

  1. Not limited to one tissue or location; widespread.


  1. To spread or to be spread widely, as through a tissue.

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