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a large white bear, Ursus maritimus, of the arctic regions.
a white carnivorous bear, Thalarctos maritimus, of coastal regions of the North Pole


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  • Polar bond

    polar bond A type of covalent bond between two atoms in which electrons are shared unequally. Because of this, one end of the molecule has a slightly negative charge and the other a slightly positive charge. See more at covalent bond.

  • Polar-cap

    noun 1. Geology. the icecap situated at either end of the earth’s poles. 2. Astronomy. either of the two bright areas around the poles of the planet Mars, consisting of water ice and frozen carbon dioxide. polar cap

  • Polar cataract

    polar cataract n. A capsular cataract limited to the anterior or posterior polar region of the lens.

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