Source : Webster's Revised Unabridged Dictionary (1913)

Catelectrotonus \Cat`e*lec*trot"o*nus\, n. [NL., fr. Gr. ? down
   + ? (see {Electro-}) + ? tone.] (Physics)
   The condition of increased irritability of a nerve in the
   region of the cathode or negative electrode, on the passage
   of a current of electricity through it.