The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]