Source : Webster's Revised Unabridged Dictionary (1913)

Electrotonic \E*lec`tro*ton"ic\, a.
   1. (Physics) Of or pertaining to electrical tension; -- said
      of a supposed peculiar condition of a conducting circuit
      during its exposure to the action of another conducting
      circuit traversed by a uniform electric current when both
      circuits remain stationary. --Faraday.

   2. (Physiol.) Relating to electrotonus; as, the electrotonic
      condition of a nerve.