The Collaborative International Dictionary
Electrotonus
Electrotonus \E`lec*trot"o*nus\, n. [NL., fr. combining form electro- + Gr. ? tension.] (Physiol.) The modified condition of a nerve, when a constant current of electricity passes through any part of it. See Anelectrotonus, and Catelectrotonus.
Wiktionary
electrotonus
n. (context biology English) The variation of the excitability and conductivity of a nerve or muscle as an electric current passes through it