polar >> /ˈpoʊlər/
Definition: [noun] The straight line joining the two points at which tangents from a fixed point touch a conic section.
Example: Sturm's theoretical work in mathematical physics involved the study of caustic curves, and poles and polars of conic sections.
Definition: [noun] A variable binary star which emits strongly polarized light, one component being a strongly magnetic white dwarf.
Definition: [adjective] Relating to the North or South Pole.
Example: the polar regions
Definition: [adjective] Having electrical or magnetic polarity.
Example: Another active area of biophysical research concerns the study of the interactions involving charged, polar and polarizable groups of atoms in proteins.
Definition: [adjective] Directly opposite in character or tendency.
Example: depression and its polar opposite, mania