bipolar

adjective

• 1having or relating to two poles or extremities:a sharply bipolar division of affluent and underclass
• relating to or occurring in both North and South polar regions:bipolar species

• 2(of psychiatric illness) characterized by both manic and depressive episodes, or manic ones only.
• (of a person) suffering from bipolar disorder.

• 3(of a nerve cell) having two axons, one either side of the cell body.

• 4 Electronics (of a transistor or other device) using both positive and negative charge carriers.