Meaning of nebula

neb•u•la

1. Also calleddiffuse nebula.a cloud of interstellar gas and dust. Cf.dark nebula, emission nebula, reflection nebula.
2. (formerly) any celestial object that appears nebulous, hazy, or fuzzy, and extended in a telescope view.
1. a faint opacity in the cornea.
2. cloudiness in the urine.
3. any liquid medication prepared for use as a spray.