Diffuser and Diffusive

(n.) One who or that which, diffuses.

noun

• Baffle that distributes sound waves evenly.
  • synonyms: diffusor
• Optical device that distributes the light of a lamp evenly.
  • synonyms: diffusor

adjective

• Spreading by diffusion.
  • synonyms: diffusing, dispersive, disseminative

(a.) Having the quality of diffusing; capable of spreading every way by flowing; spreading widely; widely reaching; copious; diffuse.