u·ni·po·lar / ˌyoōnəˈpōlər/ • adj. having or relating to a single pole or kind of polarity: a unipolar magnetic charge. ∎  (of psychiatric illness) characterized by either depressive or (more rarely) manic episodes but not both. Compare with bipolar disorder. ∎  (of a nerve cell) having only one axon or process. ∎  Electronics (of a transistor or other device) using charge carriers of a single polarity.DERIVATIVES: u·ni·po·lar·i·ty n.

unipolar (yoo-ni-poh-ler) adj. (in neurology) describing a neurone that has one main process extending from the cell body. Compare bipolar.