Webster's English Dictionary

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polar

1. po.lar \'po--l*r\ aj [NL polaris, fr. L polus pole] 1a: of or relating 
   to a geographical pole or the region around it  1b: coming from or having 
   the characteristics of such a region  2: of or relating to one or more 
   poles (as of a magnet)  3: serving as a guide  4: diametrically opposite  
   5: having a pair of equal and opposite charges {~ compound}  6: resembling 
   a pole or axis around which all else revolves : PIVOTAL 
2. polar n : a straight line related to a point; specif : the straight line 
   j oining the points of contact of the tangents from a point exterior to a 
   conic section