1550s, from Middle French polaire (16c.) or directly from Medieval Latin polaris "of or pertaining to the poles," from Latin polus "an end of an axis" (see pole (n.2)). Meaning "directly opposite in character or tendency" is attested from 1832. Polar bear first recorded 1781.
polar po·lar (pō'lər)
Of or relating to a pole.
Having poles. Used of certain nerve cells having one or more processes.