DICT.TW Dictionary Taiwan

 A·gon·ic a.  Not forming an angle.
 Agonic line Physics, an imaginary line on the earth's surface passing through those places where the magnetic needle points to the true north; the line of no magnetic variation. There is one such line in the Western hemisphere, and another in the Eastern hemisphere.
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 agonic line
      n : an imaginary line connecting points on the Earth's surface
          where the magnetic declination is zero