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Noun: nebulosity  ,ne-byu'ló-su-tee
  1. The state or quality of being nebulous; cloudiness; haziness
    "The nebulosity of the distant galaxies made precise observations difficult"
     
  2. (astronomy) a cloudy mass of interstellar dust and gas
    "The telescope revealed the intricate nebulosity within the star-forming region"

Derived forms: nebulosities

Encyclopedia: Nebulosity