Also, homopolar. Physics. having or pertaining to a single magnetic or electric pole.
Anatomy. of or pertaining to a nerve cell in spinal and cranial ganglia in which the incoming and outgoing processes fuse outside the cell body.

1805–15; uni- + polar

unipolarity [yoo-nuh-poh-lar-i-tee, -puh-] , noun
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World English Dictionary
unipolar (ˌjuːnɪˈpəʊlə)
1.  of, concerned with, or having a single magnetic or electric pole
2.  (of a nerve cell) having a single process
3.  (of a transistor) utilizing charge carriers of one polarity only, as in a field-effect transistor
4.  (of nervous depression) occurring without accompanying bouts of mania
5.  See bipolar dominated by one superpower, esp the United States

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American Heritage
Medical Dictionary

unipolar u·ni·po·lar (yōō'nĭ-pō'lər)

  1. Having a single fibrous process. Used of a neuron.

  2. Situated at only one extremity of a cell.

u'ni·po·lar'i·ty (-pō-lār'ĭ-tē, -pə-) n.
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