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Definition of polar
1of or relating to the North or South Pole:the polar regions (of an animal or plant) living in the north or south polar region. Astronomy of or relating to the poles of a celestial body. Astronomy of or relating to a celestial pole. Geometry of or relating to the poles of a sphere. See pole2. Biology of or relating to the poles of a cell, organ, or part. 2 Physics
& Chemistry having electrical or magnetic polarity.
(of a liquid, especially a solvent) consisting of molecules with a dipole moment. 3directly opposite in character or tendency:depression and its polar opposite, mania
1 Geometry the straight line joining the two points at which tangents from a fixed point touch a conic section. 2 Astronomy a variable binary star that emits strongly polarized light, one component being a strongly magnetic white dwarf.