magnetic meridian

a line on the earth's surface, passing in the direction of the horizontal component of the earth's magnetic field. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
magnetic meridian
a continuous imaginary line around the surface of the earth passing through both magnetic poles

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
magnetic meridian  
An imaginary reference line passing through both geomagnetic poles of the Earth, used in models and maps of the Earth's magnetic field.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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