Definition of electrotonus in US English:

electrotonus

noun

Physiology
  • Originally: a state of altered excitability produced in a nerve by passing an electric current through it. Later also: the passive spread of depolarization along a neurite, neuron, or other excitable cell.

Origin

Mid 19th century. From German Electrotonus (now Elektrotonus) from electro- + Tonus, after elektrotonisch electrotonic.

Pronunciation

electrotonus

/ɪˌlɛktrəʊˈtəʊnəs/