Source : Webster's Revised Unabridged Dictionary (1913)

Nubecula \Nu*bec"u*la\, n.; pl. {Nubecul[ae]} (-l[=e]). [L.,
   dim. of nubes cloud.]
   1. (Astron.)
      (a) A nebula.
      (b) pl. Specifically, the Magellanic clouds.

   2. (Med.)
      (a) A slight spot on the cornea.
      (b) A cloudy object or appearance in urine. --Dunglison.