[ey-klin-ik] 
| an imaginary line on the surface of the earth, close and approximately parallel to the equator, connecting all those points over which a magnetic needle shows no inclination from the horizontal. |
| a·clin·ic line (ā-klĭn'ĭk) n. See magnetic equator. [From Greek aklinēs, not inclining to either side : a-, not; see a-1 + klīnein, to lean; see klei- in Indo-European roots.] |
| magnetic equator n. A line connecting all points on the earth's surface at which a magnetic needle balances horizontally without dipping. Also called aclinic line. |
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