ependyma

from WordNet (r) 3.0 (2006)

ependyma
    n 1: thin epithelial membrane lining the ventricles of the brain
         and the spinal cord canal

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]