"having two poles," from bi- + polar; 1810 with figurative sense of "of double aspect;" 1859 with reference to physiology. Psychiatric use in reference to what had been called manic-depressive psychosis is said to have begun 1957 with German psychiatrist Karl Leonhard. The term became popular early 1990s. Bipolar disorder was in DSM III (1980).
1. In the 1960 s the IC market was broadly on bipolar transistors.
2. Perfectly normal bipolar embryoids are formed.
3. Because of their simplicity, bipolar lead systems were the first to be used in clinical electrocardiography.
4. Two specialized epidermal cells and a bipolar neuron are associated with each sensillum.
5. It is possible to drive unipolar stepper motors with bipolar drivers.