Adjective diffuse has 2 senses
  1. diffuse - spread out; not concentrated in one place; "a large diffuse organization"
    Antonym:
    concentrated (indirect, via distributed)
  2. diffuse - lacking conciseness; "a diffuse historical novel"
    Antonym:
    concise (indirect, via prolix)
,Noun diffuser has 2 senses
  1. diffuser, diffusor - baffle that distributes sound waves evenly
    --1 is a kind of baffle, baffle board
  2. diffuser, diffusor - optical device that distributes the light of a lamp evenly
    --2 is a kind of optical device
    --2 is a part of lamp; lighting fixture
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