Source : Webster's Revised Unabridged Dictionary (1913)

Ependyma \Ep*en"dy*ma\, n. [NL., fr. Gr. ? an upper garment;
   'epi` upon + ? a garment; ? in + ? to put on.] (Anat.)
   The epithelial lining of the ventricles of the brain and the
   canal of the spinal cord; endyma; ependymis.

Source : WordNet®

ependyma
     n : thin epithelial membrane lining the ventricles of the brain
         and the spinal cord canal