Source : Webster's Revised Unabridged Dictionary (1913)

Cephalitis \Ceph`a*li"tis\, n. [NL., fr. Gr. ? head + -itis.]
   (Med.)
   Same as {Phrenitis}.

Source : WordNet®

cephalitis
     n : inflammation of the brain usually caused by a virus;
         symptoms include headache and neck pain and drowsiness
         and nausea and fever (`phrenitis' is no longer in
         scientific use) [syn: {encephalitis}, {phrenitis}]