The word polar is an adjective. Polar means (1) having a pair of equal and opposite charges, (2) being of crucial importance, (3) extremely cold, (4) characterized by opposite extremes; completely opposed.
Polar is also an adjective that means (1) of or existing at or near a geographical pole or within the Arctic or Antarctic Circles, (2) located at or near or coming from the earth's poles.
The following articles and web pages elaborate on the word polar.
The subarctic regions comprise lands that lie just south of the Arctic Circle, including areas of Canada and Siberia. Learn about the topography and climate of the subarctic region.