Unipolar

a.
  1. (Physics) Having, or acting by means of, one pole only.
  2. (Anat.) Having but one pole or process; -- applied to those ganglionic nerve cells which have but one radiating process; -- opposed to multipolar.
    3. Unipolar induction (Elec.),
    induction, as in a conducting circuit, by only one pole of a magnet.
    Unipolar stimulation (Physiol.),
    the simulation sometimes produced when one electrode of an induction apparatus is applied to a nerve; -- called also unipolar induction action.