electrotonus

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Alteration in excitability and conductivity of a nerve or muscle during the passage of an electric current through it.

from The Century Dictionary.

• Of or pertaining to electrical tension.
• Of, pertaining to, produced by electrotonus.
• noun The altered state of a nerve or a muscle during the passage of a galvanic current through it.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Physiol.) The modified condition of a nerve, when a constant current of electricity passes through any part of it. See anelectrotonus, and catelectrotonus.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biology The variation of the excitability and conductivity of a nerve or muscle as an electric current passes through it