nebula

  1. Noun.  (astronomy) A cloud in outer space consisting of gas or dust (e.g. a cloud formed after a star explodes).
  2. Noun.  (archaic, medicine) A white spot or slight opacity of the cornea.
  3. Noun.  (obsolete, medicine) A cloudy appearance in the urine.

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This entry was last updated on RefTopia from its source on 3/20/2012.