Definitions from Wiktionary (nebula)

▸ noun:  (astronomy) A cloud in outer space consisting of gas or dust (e.g. a cloud formed after a star explodes).
▸ noun:  (archaic, medicine) A white spot or slight opacity of the cornea.
▸ noun:  (obsolete, medicine) A cloudy appearance in the urine.
▸ Also see nebula

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