\U`ni*po"lar\, a. [Uni- + polar.]
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.
{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}. --Du Bois-Reymond.