Source : Webster's Revised Unabridged Dictionary (1913)

Choroid \Cho"roid\, a. [gr. ?; ? chorion + ? form.] (Anat.)
   resembling the chorion; as, the choroid plexuses of the
   ventricles of the brain, and the choroid coat of the eyeball.
   -- n. The choroid coat of the eye. See {Eye}.

   {Choroid plexus} (Anat.), one of the delicate fringelike
      processes, consisting almost entirely of blood vessels,
      which project into the ventricles of the brain.

Source : WordNet®

choroid
     n : a highly vascular membrane in the eye between the retina and
         the sclera [syn: {choroid coat}]