Expansion of the spinal cord due to increased size of the central canal of the cord, which is filled with CSF.
An increase of fluid in the dilated central canal of the spinal cord, or in congenital cavities elsewhere in the cord substance. ... Origin: hydro-+ G. Myelos, marrow ... (05 Mar 2000) ... 
(hi″dro-mi-e´le-ә) dilatation of the central canal of the spinal cord with an abnormal accumulation of fluid.
Type: Term Pronunciation: hī′drō-mī-ē′lē-ă Definitions: 1. An increase of fluid in the dilated central canal of the spinal cord, or in congenital cavities elsewhere in the cord substance.