Source : Webster's Revised Unabridged Dictionary (1913)

Encephalon \En*ceph"a*lon\, n. [NL. See {Encephalos}.] (Anat.)
   The contents of the cranium; the brain.

Source : WordNet®

encephalon
     n : that part of the central nervous system that includes all
         the higher nervous centers; enclosed within the skull;
         continuous with the spinal cord [syn: {brain}]
     [also: {encephala} (pl)]